Alexandre Schulz / xsd2tkform

spase-2.4.0.xsd 442 KB
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<?xml version="1.0" encoding="UTF-8"?>
<!-- Automatically created based on the specification available at http://www.spase-group.org/model -->
<!-- Version: 2.4.0 -->
<!-- Generated: 2021-06-10 -->
<xsd:schema
	      targetNamespace="http://www.spase-group.org/data/schema"
	      xmlns:xsd="http://www.w3.org/2001/XMLSchema"
	      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	      xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning"
	      xmlns:spase="http://www.spase-group.org/data/schema"
	      elementFormDefault="qualified"
	      attributeFormDefault="unqualified"
	      vc:minVersion="1.1"
	      version="2.4.0"
>

   <!-- Document root element -->
   <xsd:element name="Spase" type="spase:Spase" />

   <xsd:complexType name="Spase">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Space Physics Archive Search and Extract (SPASE). The outermost container or envelope for SPASE metadata. This indicates the start of the SPASE metadata.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Version" type="spase:Version" minOccurs="1" maxOccurs="1" />
         <xsd:choice minOccurs="1" maxOccurs="unbounded">
            <xsd:element name="Catalog" type="spase:Catalog" />
            <xsd:element name="DisplayData" type="spase:DisplayData" />
            <xsd:element name="NumericalData" type="spase:NumericalData" />
            <xsd:element name="Document" type="spase:Document" />
            <xsd:element name="Software" type="spase:Software" />
            <xsd:element name="Granule" type="spase:Granule" />
            <xsd:element name="Instrument" type="spase:Instrument" />
            <xsd:element name="Observatory" type="spase:Observatory" />
            <xsd:element name="Person" type="spase:Person" />
            <xsd:element name="Registry" type="spase:Registry" />
            <xsd:element name="Repository" type="spase:Repository" />
            <xsd:element name="Service" type="spase:Service" />
            <xsd:element name="Annotation" type="spase:Annotation" />
         </xsd:choice>
      </xsd:sequence>
         <xsd:attribute name="lang" type="xsd:string" default="en"/>
   </xsd:complexType>
   <xsd:complexType name="Catalog">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A tabular listing of events or observational notes, especially those that have utility in aiding a user in locating data. Catalogs include lists of events, files in a product, and data availability. A Catalog resource is a type of &quot;&quot;data product&quot;&quot; which is a set of data that is uniformly processed and formatted, from one or more instruments, typically spanning the full duration of the observations of the relevant instrument(s). A data product may consist of a collection of granules of successive time spans, but may be a single high-level entity.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ResourceHeader" type="spase:ResourceHeader" minOccurs="1" maxOccurs="1" />
         <xsd:element name="AccessInformation" type="spase:AccessInformation" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="ProviderName" type="spase:ProviderName" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ProviderResourceName" type="spase:ProviderResourceName" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ProviderVersion" type="spase:ProviderVersion" minOccurs="0" maxOccurs="1" />
         <xsd:element name="InstrumentID" type="spase:InstrumentID" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="PhenomenonType" type="spase:PhenomenonType" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="TimeSpan" type="spase:TimeSpan" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Caveats" type="spase:Caveats" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Keyword" type="spase:Keyword" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="InputResourceID" type="spase:InputResourceID" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Parameter" type="spase:Parameter" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Extension" type="spase:Extension" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="ResourceHeader">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Attributes of a resource which pertain to the provider of the resource and descriptive information about the resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceName" type="spase:ResourceName" minOccurs="1" maxOccurs="1" />
         <xsd:element name="AlternateName" type="spase:AlternateName" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="DOI" type="spase:DOI" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ReleaseDate" type="spase:ReleaseDate" minOccurs="1" maxOccurs="1" />
         <xsd:element name="RevisionHistory" type="spase:RevisionHistory" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ExpirationDate" type="spase:ExpirationDate" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Description" type="spase:Description" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Acknowledgement" type="spase:Acknowledgement" minOccurs="0" maxOccurs="1" />
         <xsd:element name="PublicationInfo" type="spase:PublicationInfo" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Funding" type="spase:Funding" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Contact" type="spase:Contact" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="InformationURL" type="spase:InformationURL" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Association" type="spase:Association" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="PriorID" type="spase:PriorID" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="RevisionHistory">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A history of changes that improve or upgrade. 
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="RevisionEvent" type="spase:RevisionEvent" minOccurs="1" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="RevisionEvent">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A specific change that improves or upgrades. 
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ReleaseDate" type="spase:ReleaseDate" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Note" type="spase:Note" minOccurs="1" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="PublicationInfo">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Information related to the issuing of a book, journal, piece of music, or other work.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Authors" type="spase:Authors" minOccurs="1" maxOccurs="1" />
         <xsd:element name="PublicationDate" type="spase:PublicationDate" minOccurs="1" maxOccurs="1" />
         <xsd:element name="PublishedBy" type="spase:PublishedBy" minOccurs="1" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Funding">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The source of financial support (funding) for the resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Agency" type="spase:Agency" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Project" type="spase:Project" minOccurs="1" maxOccurs="1" />
         <xsd:element name="AwardNumber" type="spase:AwardNumber" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Contact">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The person or organization who may be able to provide special assistance or serve as a channel for communication for additional information about a resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="PersonID" type="spase:PersonID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Role" type="spase:Role" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="StartDate" type="spase:StartDate" minOccurs="0" maxOccurs="1" />
         <xsd:element name="StopDate" type="spase:StopDate" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Note" type="spase:Note" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="InformationURL">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Attributes of the method of acquiring additional information.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Name" type="spase:Name" minOccurs="0" maxOccurs="1" />
         <xsd:element name="URL" type="spase:URL" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Description" type="spase:Description" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Language" type="spase:Language" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Association">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Attributes of a relationship a resource has with another resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="AssociationID" type="spase:AssociationID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="AssociationType" type="spase:AssociationType" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Note" type="spase:Note" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="AccessInformation">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Attributes of the resource which pertain to how to accessing the resource, availability and storage format.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="RepositoryID" type="spase:RepositoryID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Availability" type="spase:Availability" minOccurs="0" maxOccurs="1" />
         <xsd:element name="AccessRights" type="spase:AccessRights" minOccurs="0" maxOccurs="1" />
         <xsd:element name="AccessURL" type="spase:AccessURL" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Format" type="spase:Format" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Encoding" type="spase:Encoding" minOccurs="0" maxOccurs="1" />
         <xsd:element name="DataExtent" type="spase:DataExtent" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Acknowledgement" type="spase:Acknowledgement" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="AccessURL">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Attributes of the method for accessing a resource including a URL, name and description.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Name" type="spase:Name" minOccurs="0" maxOccurs="1" />
         <xsd:element name="URL" type="spase:URL" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Style" type="spase:Style" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ProductKey" type="spase:ProductKey" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Description" type="spase:Description" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Language" type="spase:Language" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="DataExtent">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The area of storage in a file system required to store the contents of a resource. The default units for data extent is bytes.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Quantity" type="spase:Quantity" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Units" type="spase:Units" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Per" type="spase:Per" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="TimeSpan">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The duration of an interval in time.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="StartDate" type="spase:StartDate" minOccurs="1" maxOccurs="1" />
         <xsd:choice minOccurs="1" maxOccurs="1">
            <xsd:element name="StopDate" type="spase:StopDate" />
            <xsd:element name="RelativeStopDate" type="spase:RelativeStopDate" />
         </xsd:choice>
         <xsd:element name="Note" type="spase:Note" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Parameter">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A container of information regarding a parameter whose values are part of the product. Every product contains or can be related to one or more parameters.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Name" type="spase:Name" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Set" type="spase:Set" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="ParameterKey" type="spase:ParameterKey" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Description" type="spase:Description" minOccurs="0" maxOccurs="1" />
         <xsd:element name="UCD" type="spase:UCD" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Caveats" type="spase:Caveats" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Cadence" type="spase:Cadence" minOccurs="0" maxOccurs="1" />
         <xsd:element name="CadenceMin" type="spase:CadenceMin" minOccurs="0" maxOccurs="1" />
         <xsd:element name="CadenceMax" type="spase:CadenceMax" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Units" type="spase:Units" minOccurs="0" maxOccurs="1" />
         <xsd:element name="UnitsConversion" type="spase:UnitsConversion" minOccurs="0" maxOccurs="1" />
         <xsd:element name="CoordinateSystem" type="spase:CoordinateSystem" minOccurs="0" maxOccurs="1" />
         <xsd:element name="RenderingHints" type="spase:RenderingHints" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Structure" type="spase:Structure" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ValidMin" type="spase:ValidMin" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ValidMax" type="spase:ValidMax" minOccurs="0" maxOccurs="1" />
         <xsd:element name="FillValue" type="spase:FillValue" minOccurs="0" maxOccurs="1" />
         <xsd:choice minOccurs="1" maxOccurs="1">
            <xsd:element name="Field" type="spase:Field" />
            <xsd:element name="Particle" type="spase:Particle" />
            <xsd:element name="Wave" type="spase:Wave" />
            <xsd:element name="Mixed" type="spase:Mixed" />
            <xsd:element name="Support" type="spase:Support" />
         </xsd:choice>
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="CoordinateSystem">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The specification of the orientation of a set of (typically) orthogonal base axes.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="CoordinateRepresentation" type="spase:CoordinateRepresentation" minOccurs="1" maxOccurs="1" />
         <xsd:element name="CoordinateSystemName" type="spase:CoordinateSystemName" minOccurs="1" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="RenderingHints">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Attributes to aid in the rendering of parameter.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="DisplayType" type="spase:DisplayType" minOccurs="0" maxOccurs="1" />
         <xsd:element name="AxisLabel" type="spase:AxisLabel" minOccurs="0" maxOccurs="1" />
         <xsd:element name="RenderingAxis" type="spase:RenderingAxis" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Index" type="spase:Index" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ValueFormat" type="spase:ValueFormat" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ScaleMin" type="spase:ScaleMin" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ScaleMax" type="spase:ScaleMax" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ScaleType" type="spase:ScaleType" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Structure">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The organization and relationship of individual values within a quantity.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Size" type="spase:Size" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Description" type="spase:Description" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Element" type="spase:Element" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Element">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A component or individual unit of a multiple value quantity such as an array or vector.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Name" type="spase:Name" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Qualifier" type="spase:Qualifier" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Index" type="spase:Index" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ParameterKey" type="spase:ParameterKey" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Units" type="spase:Units" minOccurs="0" maxOccurs="1" />
         <xsd:element name="UnitsConversion" type="spase:UnitsConversion" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ValidMin" type="spase:ValidMin" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ValidMax" type="spase:ValidMax" minOccurs="0" maxOccurs="1" />
         <xsd:element name="FillValue" type="spase:FillValue" minOccurs="0" maxOccurs="1" />
         <xsd:element name="RenderingHints" type="spase:RenderingHints" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Field">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The space around a radiating body within which its electromagnetic attributes can exert force on another similar body that is not in direct contact.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Qualifier" type="spase:Qualifier" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="FieldQuantity" type="spase:FieldQuantity" minOccurs="1" maxOccurs="1" />
         <xsd:element name="FrequencyRange" type="spase:FrequencyRange" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="FrequencyRange">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The range of possible values for the observed frequency.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="SpectralRange" type="spase:SpectralRange" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Low" type="spase:Low" minOccurs="1" maxOccurs="1" />
         <xsd:element name="High" type="spase:High" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Units" type="spase:Units" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Bin" type="spase:Bin" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Bin">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A grouping of observations according to a band or window of a common attribute.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="BandName" type="spase:BandName" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Low" type="spase:Low" minOccurs="1" maxOccurs="1" />
         <xsd:element name="High" type="spase:High" minOccurs="1" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Particle">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A description of the types of particles observed in the measurement. This includes both direct observations and inferred observations.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ParticleType" type="spase:ParticleType" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Qualifier" type="spase:Qualifier" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="ParticleQuantity" type="spase:ParticleQuantity" minOccurs="1" maxOccurs="1" />
         <xsd:element name="AtomicNumber" type="spase:AtomicNumber" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="EnergyRange" type="spase:EnergyRange" minOccurs="0" maxOccurs="1" />
         <xsd:element name="AzimuthalAngleRange" type="spase:AzimuthalAngleRange" minOccurs="0" maxOccurs="1" />
         <xsd:element name="PolarAngleRange" type="spase:PolarAngleRange" minOccurs="0" maxOccurs="1" />
         <xsd:element name="MassRange" type="spase:MassRange" minOccurs="0" maxOccurs="1" />
         <xsd:element name="PitchAngleRange" type="spase:PitchAngleRange" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="EnergyRange">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The minimum and maximum energy values of the particles represented by a given &quot;&quot;physical parameter&quot;&quot; description.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Low" type="spase:Low" minOccurs="1" maxOccurs="1" />
         <xsd:element name="High" type="spase:High" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Units" type="spase:Units" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Bin" type="spase:Bin" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="AzimuthalAngleRange">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The range of possible azimuthal angles for a group of energy observations. Default units are degrees.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Low" type="spase:Low" minOccurs="1" maxOccurs="1" />
         <xsd:element name="High" type="spase:High" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Units" type="spase:Units" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Bin" type="spase:Bin" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="PolarAngleRange">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The range of possible polar angles for a group of energy observations. Defaults units are degrees.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Low" type="spase:Low" minOccurs="1" maxOccurs="1" />
         <xsd:element name="High" type="spase:High" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Units" type="spase:Units" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Bin" type="spase:Bin" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="MassRange">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The range of possible mass for a group of particle observations.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Low" type="spase:Low" minOccurs="1" maxOccurs="1" />
         <xsd:element name="High" type="spase:High" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Units" type="spase:Units" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Bin" type="spase:Bin" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="PitchAngleRange">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The range of possible pitch angles for a group of particle observations.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Low" type="spase:Low" minOccurs="1" maxOccurs="1" />
         <xsd:element name="High" type="spase:High" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Units" type="spase:Units" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Bin" type="spase:Bin" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Wave">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Periodic or quasi-periodic (AC) variations of physical quantities in time and space, capable of propagating or being trapped within particular regimes.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="WaveType" type="spase:WaveType" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Qualifier" type="spase:Qualifier" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="WaveQuantity" type="spase:WaveQuantity" minOccurs="1" maxOccurs="1" />
         <xsd:element name="EnergyRange" type="spase:EnergyRange" minOccurs="0" maxOccurs="1" />
         <xsd:element name="FrequencyRange" type="spase:FrequencyRange" minOccurs="0" maxOccurs="1" />
         <xsd:element name="WavelengthRange" type="spase:WavelengthRange" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="WavelengthRange">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The range of possible values for the observed wavelength.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="SpectralRange" type="spase:SpectralRange" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Low" type="spase:Low" minOccurs="1" maxOccurs="1" />
         <xsd:element name="High" type="spase:High" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Units" type="spase:Units" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Bin" type="spase:Bin" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Mixed">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A parameter derived from more than one of the type of parameter. For example, plasma beta, the ratio of plasma particle energy density to the energy density of the magnetic field permeating the plasma, is &quot;&quot;mixed.&quot;&quot;
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="MixedQuantity" type="spase:MixedQuantity" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ParticleType" type="spase:ParticleType" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Qualifier" type="spase:Qualifier" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Support">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Information useful in understanding the context of an observation, typically observed or measured coincidentally with a physical observation.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Qualifier" type="spase:Qualifier" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="SupportQuantity" type="spase:SupportQuantity" minOccurs="1" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="DisplayData">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A graphical representation of data wherein the underlying numeric values are not (readily) accessible for analysis.. Examples are line plots and spectrograms. A Display Data resource is a type of &quot;&quot;data product&quot;&quot; which is a set of data that is uniformly processed and formatted, from one or more instruments, typically spanning the full duration of the observations of the relevant instrument(s). A data product may consist of a collection of granules of successive time spans, but may be a single high-level entity.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ResourceHeader" type="spase:ResourceHeader" minOccurs="1" maxOccurs="1" />
         <xsd:element name="AccessInformation" type="spase:AccessInformation" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="ProcessingLevel" type="spase:ProcessingLevel" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ProviderName" type="spase:ProviderName" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ProviderResourceName" type="spase:ProviderResourceName" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ProviderProcessingLevel" type="spase:ProviderProcessingLevel" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ProviderVersion" type="spase:ProviderVersion" minOccurs="0" maxOccurs="1" />
         <xsd:element name="InstrumentID" type="spase:InstrumentID" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="MeasurementType" type="spase:MeasurementType" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="TemporalDescription" type="spase:TemporalDescription" minOccurs="0" maxOccurs="1" />
         <xsd:element name="SpectralRange" type="spase:SpectralRange" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="DisplayCadence" type="spase:DisplayCadence" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ObservedRegion" type="spase:Region" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Caveats" type="spase:Caveats" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Keyword" type="spase:Keyword" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="InputResourceID" type="spase:InputResourceID" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Parameter" type="spase:Parameter" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Extension" type="spase:Extension" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="TemporalDescription">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A characterization of the time over which the measurement was taken.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="TimeSpan" type="spase:TimeSpan" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Cadence" type="spase:Cadence" minOccurs="0" maxOccurs="1" />
         <xsd:element name="CadenceMin" type="spase:CadenceMin" minOccurs="0" maxOccurs="1" />
         <xsd:element name="CadenceMax" type="spase:CadenceMax" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Exposure" type="spase:Exposure" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ExposureMin" type="spase:ExposureMin" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ExposureMax" type="spase:ExposureMax" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="NumericalData">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Data stored as numerical values in one or more specified formats. A Numerical Data resource is a type of &quot;&quot;data product&quot;&quot; which is a set of data that is uniformly processed and formatted, from one or more instruments, typically spanning the full duration of the observations of the relevant instrument(s). A data product may consist of Parameters stored in a collection of granules of successive time spans or a single data granule.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ResourceHeader" type="spase:ResourceHeader" minOccurs="1" maxOccurs="1" />
         <xsd:element name="AccessInformation" type="spase:AccessInformation" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="ProcessingLevel" type="spase:ProcessingLevel" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ProviderName" type="spase:ProviderName" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ProviderResourceName" type="spase:ProviderResourceName" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ProviderProcessingLevel" type="spase:ProviderProcessingLevel" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ProviderVersion" type="spase:ProviderVersion" minOccurs="0" maxOccurs="1" />
         <xsd:element name="InstrumentID" type="spase:InstrumentID" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="MeasurementType" type="spase:MeasurementType" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="TemporalDescription" type="spase:TemporalDescription" minOccurs="0" maxOccurs="1" />
         <xsd:element name="SpectralRange" type="spase:SpectralRange" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="ObservedRegion" type="spase:Region" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Caveats" type="spase:Caveats" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Keyword" type="spase:Keyword" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="InputResourceID" type="spase:InputResourceID" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Parameter" type="spase:Parameter" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Extension" type="spase:Extension" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Document">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A set of information designed and presented as an individual entity. A document may contain plain or formatted text, in-line graphics, sound, other multimedia data, or hypermedia references. A Document resource is intended for use on digital objects that have no other identifier (e.g., DOI or ISBN).
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ResourceHeader" type="spase:ResourceHeader" minOccurs="1" maxOccurs="1" />
         <xsd:element name="AccessInformation" type="spase:AccessInformation" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Keyword" type="spase:Keyword" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="DocumentType" type="spase:DocumentType" minOccurs="1" maxOccurs="1" />
         <xsd:element name="MIMEType" type="spase:MIMEType" minOccurs="1" maxOccurs="1" />
         <xsd:element name="InputResourceID" type="spase:InputResourceID" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Software">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         An application which can be installed, built or readily used.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ResourceHeader" type="spase:ResourceHeader" minOccurs="1" maxOccurs="1" />
         <xsd:element name="SoftwareVersion" type="spase:SoftwareVersion" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ApplicationInterface" type="spase:ApplicationInterface" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="CodeLanguage" type="spase:CodeLanguage" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Prerequisites" type="spase:Prerequisites" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Platform" type="spase:Platform" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="InputProperty" type="spase:InputProperty" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="OutputProperty" type="spase:OutputProperty" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Platform">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A compulsory or necessary condition.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="OperatingSystem" type="spase:OperatingSystem" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Installer" type="spase:Installer" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Cores" type="spase:Cores" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Storage" type="spase:Storage" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Memory" type="spase:Memory" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Installer">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A piece of software that installs a program or package on a system.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Availability" type="spase:Availability" minOccurs="0" maxOccurs="1" />
         <xsd:element name="AccessRights" type="spase:AccessRights" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Acknowledgement" type="spase:Acknowledgement" minOccurs="0" maxOccurs="1" />
         <xsd:element name="URL" type="spase:URL" minOccurs="1" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="InputProperty">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A container of attributes regarding an input property of an application.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Name" type="spase:Name" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Description" type="spase:Description" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Caveats" type="spase:Caveats" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Units" type="spase:Units" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ValidMin" type="spase:ValidMin" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ValidMax" type="spase:ValidMax" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="OutputProperty">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A container of attributes regarding an output property of an application.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="Name" type="spase:Name" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Description" type="spase:Description" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Caveats" type="spase:Caveats" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Units" type="spase:Units" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ValidMin" type="spase:ValidMin" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ValidMax" type="spase:ValidMax" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Granule">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         An accessible portion of another resource. A Granule may be composed of one or more physical pieces (files) which are considered inseparable. For example, a data storage format that maintains metadata and binary data in separate, but tightly coupled files. Granules should not be used to group files that have simple relationships or which are associated through a parent resource. For example, each file containing a time interval data for a Numerical Data resource would each be considered a Granule. The ParentID of a Granule resource must be a NumericalData resource. The attributes of a Granule supersede the corresponding attributes in the NumericalData resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ReleaseDate" type="spase:ReleaseDate" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ExpirationDate" type="spase:ExpirationDate" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ParentID" type="spase:ParentID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="PriorID" type="spase:PriorID" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="StartDate" type="spase:StartDate" minOccurs="1" maxOccurs="1" />
         <xsd:element name="StopDate" type="spase:StopDate" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Source" type="spase:Source" minOccurs="1" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Source">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The location and attributes of an object.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="SourceType" type="spase:SourceType" minOccurs="1" maxOccurs="1" />
         <xsd:element name="URL" type="spase:URL" minOccurs="1" maxOccurs="1" />
         <xsd:element name="MirrorURL" type="spase:MirrorURL" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Checksum" type="spase:Checksum" minOccurs="0" maxOccurs="1" />
         <xsd:element name="DataExtent" type="spase:DataExtent" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Checksum">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A computed value that is dependent upon the contents of a digital data object. Primarily used to check whether errors or alterations have occurred during the transmission or storage of a data object.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="HashValue" type="spase:HashValue" minOccurs="1" maxOccurs="1" />
         <xsd:element name="HashFunction" type="spase:HashFunction" minOccurs="1" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Instrument">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A device that makes measurements used to characterize a physical phenomenon, or a family of like devices.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ResourceHeader" type="spase:ResourceHeader" minOccurs="1" maxOccurs="1" />
         <xsd:element name="InstrumentType" type="spase:InstrumentType" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="InstrumentGroupID" type="spase:InstrumentGroupID" minOccurs="0" maxOccurs="1" />
         <xsd:element name="InvestigationName" type="spase:InvestigationName" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="OperatingSpan" type="spase:OperatingSpan" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ObservatoryID" type="spase:ObservatoryID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Caveats" type="spase:Caveats" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Extension" type="spase:Extension" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="OperatingSpan">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The interval in time from the first point at which an instrument or spacecraft was producing and sending data until the last such time, ignoring possible gaps.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="StartDate" type="spase:StartDate" minOccurs="1" maxOccurs="1" />
         <xsd:element name="StopDate" type="spase:StopDate" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Note" type="spase:Note" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Observatory">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The host (spacecraft, network, facility) for instruments making observations, or a family of closely related hosts.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ResourceHeader" type="spase:ResourceHeader" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ObservatoryGroupID" type="spase:ObservatoryGroupID" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Location" type="spase:Location" minOccurs="1" maxOccurs="1" />
         <xsd:element name="OperatingSpan" type="spase:OperatingSpan" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Extension" type="spase:Extension" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Location">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A position in space definable by a regional referencing system and geographic coordinates.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ObservatoryRegion" type="spase:Region" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="CoordinateSystemName" type="spase:CoordinateSystemName" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Latitude" type="spase:Latitude" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Longitude" type="spase:Longitude" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Elevation" type="spase:Elevation" minOccurs="0" maxOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Person">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         An individual human being.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ReleaseDate" type="spase:ReleaseDate" minOccurs="0" maxOccurs="1" />
         <xsd:element name="PersonName" type="spase:PersonName" minOccurs="0" maxOccurs="1" />
         <xsd:element name="OrganizationName" type="spase:OrganizationName" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Address" type="spase:Address" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Email" type="spase:Email" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="PhoneNumber" type="spase:PhoneNumber" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="FaxNumber" type="spase:FaxNumber" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ORCIdentifier" type="spase:ORCIdentifier" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Note" type="spase:Note" minOccurs="0" maxOccurs="1" />
         <xsd:element name="Extension" type="spase:Extension" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Registry">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A location or facility where resources are cataloged.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ResourceHeader" type="spase:ResourceHeader" minOccurs="1" maxOccurs="1" />
         <xsd:element name="AccessURL" type="spase:AccessURL" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Extension" type="spase:Extension" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Repository">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A location or facility where resources are stored.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ResourceHeader" type="spase:ResourceHeader" minOccurs="1" maxOccurs="1" />
         <xsd:element name="AccessURL" type="spase:AccessURL" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Extension" type="spase:Extension" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Service">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A location or facility that can perform a well defined task.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ResourceHeader" type="spase:ResourceHeader" minOccurs="1" maxOccurs="1" />
         <xsd:element name="AccessURL" type="spase:AccessURL" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Extension" type="spase:Extension" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="Annotation">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Information which is explanatory or descriptive which is associated with another resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ResourceID" type="spase:ResourceID" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ResourceHeader" type="spase:ResourceHeader" minOccurs="1" maxOccurs="1" />
         <xsd:element name="ImageURL" type="spase:ImageURL" minOccurs="0" maxOccurs="1" />
         <xsd:element name="AnnotationType" type="spase:AnnotationType" minOccurs="1" maxOccurs="1" />
         <xsd:element name="PhenomenonType" type="spase:PhenomenonType" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ClassificationMethod" type="spase:ClassificationMethod" minOccurs="0" maxOccurs="1" />
         <xsd:element name="ConfidenceRating" type="spase:ConfidenceRating" minOccurs="0" maxOccurs="1" />
         <xsd:element name="TimeSpan" type="spase:TimeSpan" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="ObservationExtent" type="spase:ObservationExtent" minOccurs="0" maxOccurs="unbounded" />
         <xsd:element name="Extension" type="spase:Extension" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="ObservationExtent">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The spatial area encompassed by an observation.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:element name="ObservedRegion" type="spase:Region" minOccurs="0" maxOccurs="1" />
         <xsd:element name="StartLocation" type="spase:StartLocation" minOccurs="1" maxOccurs="1" />
         <xsd:element name="StopLocation" type="spase:StopLocation" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Note" type="spase:Note" minOccurs="0" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:complexType>

   <xsd:complexType name="Extension">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A container of other metadata which is not part of the SPASE data model. The contents of this element are defined by individual usage. The organization and content are constrained by the implementation. For example, in an XML representation of the SPASE metadata the content must conform to the XML specifications.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:sequence>
         <xsd:any minOccurs="0" maxOccurs="unbounded" processContents="lax" />
      </xsd:sequence>
         <xsd:attribute name="lang" type="xsd:string" default="en"/>
   </xsd:complexType>
<!-- ================================
      Groups
     ================================ -->
   <xsd:group name="ParameterEntity">
      <xsd:sequence>
         <xsd:element name="Field" type="spase:Field" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Particle" type="spase:Particle" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Wave" type="spase:Wave" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Mixed" type="spase:Mixed" minOccurs="1" maxOccurs="1" />
         <xsd:element name="Support" type="spase:Support" minOccurs="1" maxOccurs="1" />
      </xsd:sequence>
   </xsd:group>
   <xsd:group name="ResourceEntity">
      <xsd:sequence>
         <xsd:element name="Catalog" type="spase:Catalog" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="DisplayData" type="spase:DisplayData" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="NumericalData" type="spase:NumericalData" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Document" type="spase:Document" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Software" type="spase:Software" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Granule" type="spase:Granule" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Instrument" type="spase:Instrument" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Observatory" type="spase:Observatory" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Person" type="spase:Person" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Registry" type="spase:Registry" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Repository" type="spase:Repository" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Service" type="spase:Service" minOccurs="1" maxOccurs="unbounded" />
         <xsd:element name="Annotation" type="spase:Annotation" minOccurs="1" maxOccurs="unbounded" />
      </xsd:sequence>
   </xsd:group>
   <xsd:group name="StopDateEntity">
      <xsd:sequence>
         <xsd:element name="StopDate" type="spase:StopDate" minOccurs="1" maxOccurs="1" />
         <xsd:element name="RelativeStopDate" type="spase:RelativeStopDate" minOccurs="1" maxOccurs="1" />
      </xsd:sequence>
   </xsd:group>
<!-- ================================
      Dictionary Terms
     ================================ -->
   <xsd:simpleType name="Acknowledgement">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The individual, group or organization which should be acknowledged when the data is used in or contributes to a presentation or publication.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Address">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Directions for finding some location; written on letters or packages that are to be delivered to that location.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Agency">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The name of an organization that provides a service or funding for specific projects.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="AlternateName">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         An alternative or shortened name used to refer to a resource. This includes acronyms, expanded names or a synonym for a resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="AssociationID">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The resource identifier for a resource with which this resource is closely associated.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="AtomicNumber">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The number of protons in the nucleus of an atom.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:double" />
   </xsd:simpleType>
   <xsd:simpleType name="Authors">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A list of individuals or organizations who prepared a work for publication. Separate multiple names with &quot;&quot;;&quot;&quot;. When an author is a persons use &quot;&quot;last,first[ middle]&quot;&quot; format. Including a middle name is optional.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="AwardNumber">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The identifying information assigned to the financial support (funding) of a project.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="AxisLabel">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A short character string (approximately 10 characters, but preferably 6 characters - more only if absolutely required for clarity) which can be used to label a y-axis for a plot or to provide a heading for a data listing.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="BandName">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A common or provider assigned name for a range of values.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Cadence">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The nominal or most common time interval between the start of successive measurements.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:duration" />
   </xsd:simpleType>
   <xsd:simpleType name="CadenceMax">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The largest time interval between the start of successive measurements.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:duration" />
   </xsd:simpleType>
   <xsd:simpleType name="CadenceMin">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The smallest time interval between the start of successive measurements.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:duration" />
   </xsd:simpleType>
   <xsd:simpleType name="Caveats">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Information which may be important in the avoidance of the misuse of the resource, for instance instrument maladies, corruption or contamination.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="CodeLanguage">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A formal language, which comprises a set of instructions that produce various kinds of output.  
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Cores">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         An application processor that is part of a CPU. 
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:double" />
   </xsd:simpleType>
   <xsd:simpleType name="Description">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A narrative explanation with detail appropriate for the item it describes. For example a description of data resource should include discussions of the main quantities in the resource, possible uses and search terms. A description should also include whether any corrections (i.e, geometry, inertial) have been applied to the resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="DisplayCadence">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The time interval between the successive display elements.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:duration" />
   </xsd:simpleType>
   <xsd:simpleType name="DOI">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A digital object identifier (DOI) is a unique alphanumeric string assigned by a registration agency (the International DOI Foundation) to identify content and provide a persistent link to its location on the Internet. 
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Elevation">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The distance in meters above (positive) or below (negative) the &quot;&quot;zero elevation&quot;&quot; defined by the World Geodetic System reference frame (WGS84).
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:double" />
   </xsd:simpleType>
   <xsd:simpleType name="Email">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The electronic address at which the individual may be contacted expressed in the form &quot;&quot;local-part@domain&quot;&quot;.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ExpirationDate">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The date and time when a resource is no longer available. If the Expiration Date is specified then it indicates that resource should not be made available after that time. However, this is only advisory and in practice a resource description should be unpublished to eliminate access to a resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:dateTime" />
   </xsd:simpleType>
   <xsd:simpleType name="Exposure">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The time interval over which an individual measurement is taken.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:duration" />
   </xsd:simpleType>
   <xsd:simpleType name="ExposureMax">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The largest interval over which an individual measurement is taken.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:duration" />
   </xsd:simpleType>
   <xsd:simpleType name="ExposureMin">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The smallest time interval over which an individual measurement is taken.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:duration" />
   </xsd:simpleType>
   <xsd:simpleType name="FaxNumber">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The symbols and numerals required to send a facsimile (FAX) to an individual by telephone. The string may contain punctuation marks such as dash (-) or dot (.) to separate fields within the string.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="FillValue">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A value that indicates that a quantity is undefined.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="HashValue">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The value calculated by a hash function, e.g. the message digest of a digital data object.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="High">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The largest value within a range of possible values.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:double" />
   </xsd:simpleType>
   <xsd:simpleType name="ImageURL">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A URL to graphic, image or movie.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:anyURI" />
   </xsd:simpleType>
   <xsd:simpleType name="Index">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The location of an item in an array or vector. An index can be multivalued to represent the location in a multidimensional object. The index of the first item is &quot;&quot;1&quot;&quot;. A value of &quot;&quot;0&quot;&quot; is a wild card for all elements at the location in an array. A value of &quot;&quot;-1&quot;&quot; is a reference to the dimension at the location in the array. A &quot;&quot;-1&quot;&quot; is used when describing the attributes of the dimension, where as &quot;&quot;0&quot;&quot; or a positive integer is used to describe attributes of individual elements.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="spase:typeSequence" />
   </xsd:simpleType>
   <xsd:simpleType name="InputResourceID">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The resource identifier for a resource which was used to generate this resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="InstrumentGroupID">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The identifier of an Instrument resource which the referring resource is a member of.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="InstrumentID">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The identifier of an Instrument resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="InvestigationName">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The name given to the contract or engagement which enabled the data to be produced. Each investigation is associated with a Principal Investigator or Guest Investigator who was responsible for the original proposal. For single PI missions each major subsystem having its own identified Team Leader may also be classed as an &quot;&quot;Investigation&quot;&quot; for the purposes of data archiving.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Keyword">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A word or phrase that is relevant to the resource but does not exist in other documentary information.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Language">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The two character indicator of language selected from the ISO 639-1 codes for the representation of names of languages.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Latitude">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The angular distance north (positive) or south (negative) from the equator, measured along the meridian passing through the point.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:double" />
   </xsd:simpleType>
   <xsd:simpleType name="Longitude">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The angular distance measured west (positive) or east (negative) from a north-south line called the Prime Meridian.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:double" />
   </xsd:simpleType>
   <xsd:simpleType name="Low">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The smallest value within a range of possible values.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:double" />
   </xsd:simpleType>
   <xsd:simpleType name="Memory">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The component of your computer that allows you to store and access data on a short-term basis, typically the amount of RAM. Indicate units with standard byte scales such as KB, MB, GB, TB and PB. 
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="MIMEType">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Multipurpose Internet Mail Extensions (MIME) type and sub-type which characterizes the format of a file. MIME media types are define in RFC memorandum RFC 2046. Current MIME types are maintained by Internet Assigned Numbers Authority (IANA) at http://www.iana.org/assignments/media-types/index.html. Commonly used MIME types are: application/vnd.ms-powerpoint (ppt, pptx), application/vnd.ms-excel (xls, xlsx), text/richtext (rtx), application/postscript (eps, ps), application/pdf (pdf), application/xml-dtd (dtd), text/html (htm, html), text/xml (xsl, xml, xsd), application/x-dvi (dvi). If a document is compressed the specified MIME type should be for the uncompressed document. 
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="MirrorURL">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A Uniform Resource Locator (URL) to an alternate location of a resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:anyURI" />
   </xsd:simpleType>
   <xsd:simpleType name="Name">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A language unit by which a person or thing is known.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Note">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Information which is useful or important for the understanding of a value or parameter.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ObservatoryGroupID">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The identifier of an Observatory resource which the referring resource is a member of.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ObservatoryID">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The identifier of an Observatory resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="OperatingSystem">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The software that supports a computer&#39;s basic functions, such as scheduling tasks, executing applications, and controlling peripherals.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ORCIdentifier">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A Open Researcher Contributor (ORC) identifier which is a unique alphanumeric string assigned by a registration agency (https://orcid.org/) to identify an individual. It has the format xxxx-xxxx-xxxx-xxxx
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="OrganizationName">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A unit within a company or other entity (e.g., Government agency or branch of service) within which many projects are managed as a whole.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ParameterKey">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The name or identifier which can be used to access the parameter in the resource. The associated value is dependent on the service used to access the resource. For columnar ASCII data, use &quot;&quot;Column_X&quot;&quot; for a single-element parameter and &quot;&quot;Column_X-Column_Y&quot;&quot; for a multi-element parameter, where X and Y are the relevant column index. The first column index is 1.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ParentID">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The resource identifier for a resource that a resource is a part of. The resource inherits the attributes of the referenced resource. Attributes defined in the resource override attributes of the parent in the manner prescribed by the containing resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Per">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The time interval over which a characterization applies. For example, the number of bytes generated each day.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:duration" />
   </xsd:simpleType>
   <xsd:simpleType name="PersonID">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The identifier assigned to a Person description.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="PersonName">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The words used to address an individual.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="PhoneNumber">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The symbols and numerals required to contact an individual by telephone. The string may contain punctuation marks such as dash (-) or dot (.) to separate fields within the string.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Prerequisites">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A thing that is required to be installed on your computer in order to run or compile the software.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="PriorID">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The resource identifier for a resource that is superseded or replaced by a resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ProductKey">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A string of characters used to uniquely identify a particular product within a Repository. The style or format of the identifier is determined by the Repository. The kinds of resources which can be acessed include, but are not limited to, numerical data, display data, documents and event lists. The method to access the product is determined by the attributes of an access service.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Project">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The name of an organized activity with a stated goal or objective.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ProviderName">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The source, or original provider, of the data (for example, PDS PPI)
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ProviderProcessingLevel">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The provider specific classification of the processing performed on the product.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ProviderResourceName">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A short textual description of a resource used by the provider which may be used to identify a resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ProviderVersion">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Describes the release or edition of the product used by the provider. The formation rule may vary between providers. It is intended to aid in queries to the provider regarding the product.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="PublicationDate">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The date that the work was first published.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:dateTime" />
   </xsd:simpleType>
   <xsd:simpleType name="PublishedBy">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The name or the company, organization or individual that published the work.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Quantity">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A value that describes a characteristic of a system.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:double" />
   </xsd:simpleType>
   <xsd:simpleType name="RelativeStopDate">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         An indication of the nominal end date relative to the present.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:duration" />
   </xsd:simpleType>
   <xsd:simpleType name="ReleaseDate">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The date and time when a resource is made available. The availability of a resource coincides with the release of a resource description. If the Release Date is specified as a future date then it indicates that resource should not be made available until that time. However, this is only advisory and in practice the Release Date should be the actual date the resource description was published.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:dateTime" />
   </xsd:simpleType>
   <xsd:simpleType name="RepositoryID">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The identifier of an Repository resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ResourceID">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A Resource ID is a URI that has the form &quot;&quot;scheme://authority/path&quot;&quot; where &quot;&quot;scheme&quot;&quot; is &quot;&quot;spase&quot;&quot; for those resources administered through the SPASE framework, &quot;&quot;authority&quot;&quot; is the unique identifier for the resource provider registered within the SPASE framework and &quot;&quot;path&quot;&quot; is the unique identifier of the resource within the context of the &quot;&quot;authority&quot;&quot;. The resource ID must be unique within the SPASE framework.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ResourceName">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A short textual description of a resource which may be useful when read by a person.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="RORIdentifier">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The assigned Research Organization Registry (ROR) identifier. See https://ror.org/
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ScaleMax">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The maximum value that the variable is expected to attain. Used, for example, by automated plotting software.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:double" />
   </xsd:simpleType>
   <xsd:simpleType name="ScaleMin">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The minimum value that the variable is expected to attain. Used, for example, by automated plotting software.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:double" />
   </xsd:simpleType>
   <xsd:simpleType name="Set">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A collection of items for a particular purpose.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Size">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The number of elements in each dimension of a multi-dimensional array. A scalar has a size of 1. A multi-dimensional vector will have a size for each dimension. Note that the number of elements in the size of an N-dimensional array conveys the array&#39;s dimensionality while the product of those numbers conveys the total number of elements in the array. When size is used to describe a tensor it is the number of elements in the tensor. As such it has a limited set of values. A tensor of rank 1 has a size of 3, rank 2 a size of 9, rank 3 a size of 27 and rank n a size of 3^n.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="spase:typeSequence" />
   </xsd:simpleType>
   <xsd:simpleType name="SoftwareVersion">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Describes the edition of the software release. The formation rule for the version may vary between software packages. It is intended to aid in queries to the software provider regarding the software.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="StartDate">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The specification of a starting point in time.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:dateTime" />
   </xsd:simpleType>
   <xsd:simpleType name="StartLocation">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The initial position in space.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="StopDate">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The specification of a stopping point in time.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:dateTime" />
   </xsd:simpleType>
   <xsd:simpleType name="StopLocation">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The final position in space.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Storage">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The component of your computer that allows you to store and access data on a long-term basis. Indicate units with standard byte scales such as KB, MB, GB, TB and PB. 
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="UCD">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The nature of a physical parameter expressed using the IVOA UCD1+ controlled vocabulary.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="Units">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A description of the standardized measurement increments in which a value is specified. The description is represented as a mathematical phrase. Units should be represented by widely accepted representation. For example, units should conform to the International System of Units (SI) which is maintained by BIPM (Bureau International des Poids et Mesures (see &lt;http://www.bipm.fr/&gt; ) when appropriate or use tokens like &quot;&quot;Re&quot;&quot; to represent units of the Radius of the Earth. Within a phrase the circumflex (^) is used to indicate a power, a star (*) is used to indicate multiplication and a slash (/) division. When symbols are not separated by a mathematical operator, multiplication is assumed. Symbols for base units can be found at: &lt;http://www.bipm.fr/en/si/si_brochure/chapter2/2-1/#symbols&gt; and those for common derived units can be found at: &lt;http://www.bipm.fr/en/si/derived_units/2-2-2.html&gt;
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="UnitsConversion">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The multiplicative factor for converting a unit into International System of Units (SI) units. The factor is expressed in the form &quot;&quot;number &gt; x&quot;&quot;, where &quot;&quot;number&quot;&quot; is a numerical value and &quot;&quot;x&quot;&quot; is the appropriate SI units. The basic SI units are Enumerated: m (meter), N (newton), kg (kilogram), Pa (pascal), s (second), Hz (hertz), A (ampere), V (volt), K (kelvin), W (watt), rad (radian), J (joule), sr (steradian), C (coulomb), T (tesla), ohm (ohm), mho (mho or seimens), H (henry), and F (farad). Two useful units which are not SI units are: degree (angle), and unitless (no units). An example is: &quot;&quot;1.0E-9&gt;T&quot;&quot; which converts the units, presumable nT, to Tesla. Another example is: &quot;&quot;1.0e+3&gt;m/s&quot;&quot; which converts a velocity expressed in kilometers per second to meters per second.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="URL">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Uniform Resource Locator (URL) is the global address of documents and other resources on the World Wide Web. The first part of the address indicates what protocol to use, and the second part specifies the IP address or the domain name where the resource is located followed by the pathname of the resource. A URL is specified in the form protocol://server.domain.name:port/pathname. Example protocols are HTTP or FTP, server domain name is the Internet name.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ValidMax">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The largest legitimate value.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ValidMin">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         The smallest legitimate value.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
   <xsd:simpleType name="ValueFormat">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         A string defining the output format used when extracting data values out to a file or screen. The magnitude and the number of significant figures needed should be carefully considered. The output format string can be in either Fortran or C syntax.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string" />
   </xsd:simpleType>
<!-- ================================
     Lists
     ================================ -->
<!-- ==========================
     Version
     ========================== -->
   <xsd:simpleType name="Version">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Version number.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
         <xsd:enumeration value="2.4.0" />
      </xsd:restriction>
      </xsd:simpleType>
<!-- ==========================
     List: AccessRights

     Identifiers for permissions granted or denied by the host of a product to allow other users to access and use the resource.
     ========================== -->
   <xsd:simpleType name="AccessRights">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for permissions granted or denied by the host of a product to allow other users to access and use the resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Open">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Access is granted to everyone.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PartiallyRestricted">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Some portions of the resource have restricted access, the rest is open access. Typically this is for accumulating data collections where some data is under review before being publicly released. 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Restricted">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Access to the product is regulated and requires some form of identification.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: AdiabaticInvariant

     Identifiers for properties of a physical system related to periodic phenomena that remains constant under slowly varying conditions.
     ========================== -->
   <xsd:simpleType name="AdiabaticInvariant">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for properties of a physical system related to periodic phenomena that remains constant under slowly varying conditions.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="MagneticMoment">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A constant of motion related to the gyromotion of a particle in a magnetic field that is either static or slowly varying with respect to the gyroperiod. The magnetic moment is usually denoted by using the lower case Greek letter for mu, 5, and can be calculated by using 5 = m u^2/2B where m is the particle mass, u is the velocity of the particle perpendicular to the  constant or average magnetic field direction, and B is the magnitude of the magnetic field strength.  
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="BounceMotion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The second adiabatic invariant is associated with periodic bounce motion of charged particles trapped between two magnetic mirrors on a magnetic field line. The second invariant, termed J, is defined by using the integral J = m &amp;int;  v|| * ds where m is the mass of the charged particle, v|| is the particle velocity along the field line, and ds represents elemental arc lengths along the field line. The second adiabatic invariant is conserved as long as changes in the background magnetic field occur at time scales much longer than the bounce time of the charged particles.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="DriftMotion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The third invariant for charged particle motion in a dipolar magnetic field is associated with drift of its guiding center in the equatorial plane. The conserved quantity, J&lt;sub&gt;2&lt;/sub&gt;, is equal to q&amp;Phi; where q is the particle charge and &amp;Phi; is the magnetic flux enclosed within the particle drift path. 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: AnnotationType

     Identifiers for an classification of an annotation.
     ========================== -->
   <xsd:simpleType name="AnnotationType">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for an classification of an annotation.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Anomaly">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An interval where measurements or observations may be adversely affected.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Event">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An action or observation which occurs at a point in time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Feature">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A prominent or distinctive characteristic that occurs at a location or persists over a period of time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: ApplicationInterface

     Identifiers for the type of interface for the application.
     ========================== -->
   <xsd:simpleType name="ApplicationInterface">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the type of interface for the application.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="CLI">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A command-line interface (CLI) is a form of interface where input to an application is provided as lines of text typically within a shell. 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GUI">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A graphical user interface (GUI) is a form of user interface that allows users to interact with an application through graphical icons, forms  and other elements with both a keyboard and a pointing device. 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="API">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An application programming interface (API) is a form of interface that allows applications to access the features or data of an operating system, application, or other service. An API may have a required protocol or set of principles. Some examples of protocols are SOAP, XML-RPC and JSON-RPC. An example of an API with a set of principles is REST.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: AssociationType

     Identifiers for resource associations.
     ========================== -->
   <xsd:simpleType name="AssociationType">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for resource associations.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="ChildEventOf">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A descendant or caused by another resource.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="DerivedFrom">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A transformed or altered version of a resource instance.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ObservedBy">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Detected or originating from another resource.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Other">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Not classified with more specific terms. The context of its usage may be described in related text.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PartOf">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A portion of a larger resource.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="RevisionOf">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A modified version of a resource instance.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Availability

     Identifiers for indicating the method or service which may be used to access the resource.
     ========================== -->
   <xsd:simpleType name="Availability">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for indicating the method or service which may be used to access the resource.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Offline">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Not directly accessible electronically. This includes resources which may to be moved to an on-line status in response to a given request.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Online">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Directly accessible electronically.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: ClassificationMethod

     Identifiers for the technique used to determine the characteristics of an object.
     ========================== -->
   <xsd:simpleType name="ClassificationMethod">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the technique used to determine the characteristics of an object.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Automatic">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Determined by the analysis or assessment performed by a program or server.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Inferred">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Determined by the analysis of other information or resources.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Inspection">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Determined by the analysis or assessment performed by a person.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Component

     Identifiers for the axis of coordinate systems.
     ========================== -->
   <xsd:simpleType name="Component">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the axis of coordinate systems.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="I">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Projection of a vector along the first named axis of a coordinate system. Typically the X axis, but could be the R axis for an RTN coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="J">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Projection of a vector along the second named axis of a coordinate system. Typically the Y axis, but could be the T axis for an RTN coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="K">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Projection of a vector along the third named axis of a coordinate system. Typically the Z axis, but could be the N axis for an RTN coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: ConfidenceRating

     Identifiers for the classification of the certainty of an assertion.
     ========================== -->
   <xsd:simpleType name="ConfidenceRating">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the classification of the certainty of an assertion.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Probable">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Likely given the available evidence. Considered in the range of 4-7 on a scale of 0-10.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Strong">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Highly likely given the available evidence. Considered in the range of 7-10 on a scale of 0-10.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Unlikely">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Not likely given the available evidence. Considered in the range of 0 on a scale of 0-10.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Weak">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Slightly likely given the available evidence. Considered in the range of 1-4 on a scale of 0-10.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: CoordinateRepresentation

     Identifiers of the method or form for specifying a given point or vector in a given coordinate system.
     ========================== -->
   <xsd:simpleType name="CoordinateRepresentation">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers of the method or form for specifying a given point or vector in a given coordinate system.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Cartesian">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A representation in which a position vector or a measured vector (e.g., field or flow) is specified by its components along the base axes of the coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Cylindrical">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A coordinate representation of a position vector or measured vector (field or flow) by its k-component, the magnitude of its projection into the i-j plane, and the azimuthal angle of the i-j plane projection.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Spherical">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A coordinate representation of a position vector or of a measured vector by its magnitude and two direction angles. The angles are relative to the base axes of the coordinate system used. Typically the angles are phi [azimuth angle, =arctan (j/i)] and theta, where theta may be a polar angle, arctan {[SQRT(i^2+j^2)]/k}, or an elevation angle, arctan [k/SQRT (i^2+j^2)].
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: CoordinateSystemName

     Identifiers of the origin and orientation of a set of typically orthogonal axes.
     ========================== -->
   <xsd:simpleType name="CoordinateSystemName">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers of the origin and orientation of a set of typically orthogonal axes.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Carrington">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A coordinate system which is centered at the Sun and is &quot;&quot;fixed&quot;&quot; with respect to the synodic rotation rate; the mean synodic value is about 27.2753 days. The Astronomical Almanac gives a value for Carrington longitude of 349.03 degrees at 0000 UT on 1 January 1995.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CGM">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Corrected Geomagnetic - A coordinate system from a spatial point with GEO radial distance and geomagnetic latitude and longitude, follow the epoch-appropriate IGRF/DGRF model field vector through to the point where the field line crosses the geomagnetic dipole equatorial plane. Then trace the dipole magnetic field vector Earthward from that point on the equatorial plane, in the same hemisphere as the original point, until the initial radial distance is reached. Designate the dipole latitude and longitude at that point as the CGM latitude and longitude of the original point. See &lt;http://nssdc.gsfc.nasa.gov/space/cgm/cgmm_des.html&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CSO">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Corrected Solar Orbital - A coordinate system related to Earth where X is anti-sunward, Y along the orbital velocity direction.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="DM">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Dipole Meridian - A coordinate system centered at the observation point. Z axis is parallel to the Earth&#39;s dipole axis, positive northward. X is in the plane defined by Z and the line linking the observation point with the Earth&#39;s center. Y is positive eastward. See &lt;http://cdpp.cnes.fr/00428.pdf&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ECD">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Eccentric Dipole (ECD) coordinate system that aligns with a dipole whose origin and orientation may be different from the physical center and spin axis of the containing body. The IGRF-12 coefficients for 2015 are used to determine the origin for the earth. The 2015 positions are North dip pole: latitude: 86.29, longitude -160.06. South dip pole latitide: -64.28, longitude: 136.59, North geometric pole latitude: 80.37, longitude: -72.63, South geomagnetic pole latitude: -80.37, longitude: 107.37ECD is defined in doi:10.1186/s40623-015-0228-9.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ECEF">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The Earth-Centered, Earth-Fixed (ECEF) coordinate system has point (0,0,0) defined as the center of mass of the Earth. Its axes are aligned with the International Reference Pole (IRP) and International Reference Meridian (IRM). The x-axis intersects the sphere of the Earth at 0 degree latitude (Equator) and 0 degree longitude (Greenwich). The z-axis points north. The y-axis completes the right handed coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ENP">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  ENP (also called PEN) - The P vector component points northward, perpendicular to orbit plane which for a zero degree inclination orbit is parallel to Earth&#39;s spin axis. The E vector component is perpendicular to P and N and points earthward. The N component is perpendicular to P and E and is positive eastward.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GEI">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  GEI Geocentric Equatorial Inertial - A coordinate system where the Z axis is along Earth&#39;s spin vector, positive northward. X axis points towards the first point of Aries (from the Earth towards the Sun at the vernal equinox). See Russell, 1971. When the X axis is the direction of the mean vernal equinox of J2000, the coordinate system is also called GCI. Then the Z axis is also defined as being normal to the mean Earth equator of J2000.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GEO">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Geographic - geocentric corotating - A coordinate system where the Z axis is along Earth&#39;s spin vector, positive northward. X axis lies in Greenwich meridian, positive towards Greenwich. See Russell, 1971.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GPHIO">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Kronian Solar Orbital - A coordinate system related to Saturn where X is anti-sunward, Y along the orbital velocity direction.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GSE">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Geocentric Solar Ecliptic - A coordinate system where the X axis is from Earth to Sun. Z axis is normal to the ecliptic, positive northward. See Russell, 1971.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GSEQ">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Geocentric Solar Equatorial - A coordinate system where the X axis is from Earth to Sun. Y axis is parallel to solar equatorial plane. Z axis is positive northward. See Russell, 1971
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GSM">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Geocentric Solar Magnetospheric - A coordinate system where the X axis is from Earth to Sun, Z axis is northward in a plane containing the X axis and the geomagnetic dipole axis. See Russell, 1971
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HAE">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Heliocentric Aries Ecliptic - A coordinate system where the Z axis is normal to the ecliptic plane, positive northward. X axis is positive towards the first point of Aries (from Earth to Sun at vernal equinox). Same as SE below. See Hapgood, 1992.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HCC">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Heliocentric Cartesian - A 3-D orthonormal coordinate system that is primarily intended to specify with two dimensions a point on the solar disk. The Z axis points toward the observer. The Y axis lies in the plane defined by the solar spin vector and the Z axis, positive northward. The X axis is perpendicular to the Y and Z axes, positive toward solar west. Standard representation for this system is via the point&#39;s x and y values, expressed either as physical distances or as fractions of the solar disk radius.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HCI">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Heliographic Carrington Inertial.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HCR">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Heliocentric Radial - A 3-D orthonormal coordinate system that is primarily intended to specify with two dimensions a point on the solar disk. The Z axis points toward the observer. The Y axis lies in the plane defined by the solar spin vector and the Z axis, positive northward. The X axis is perpendicular to the Y and Z axes, positive toward solar west. Standard representation for this system is via the point&#39;s distance rho from the Z axis [Rho = SQRT(x**2 + y**2)] and its phase angle psi measured counterclockwise from the +Y axis [psi = arctan (-y/x)]
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HEE">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Heliocentric Earth Ecliptic - A coordinate system where the Z axis is normal to the ecliptic plane, positive northward. X axis points from Sun to Earth. See Hapgood, 1992
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HEEQ">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Heliocentric Earth Equatorial - A coordinate system where the Z axis is normal to the solar equatorial plane, positive northward. X axis is generally Earthward in the plane defined by the Z axis and the Sun-Earth direction. See Hapgood, 1992.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HERTN">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Helio-Eclipitic Radial Tangential Normal coordinate system. Typically centered at a spacecraft. The X axis (radial) is set as the primary axis, and is defined as the axis pointing from the spacecraft to the Sun.  The Z axis (tangential) is set as the secondary axis, and is defined as that portion of the ecliptic rotational axis which is perpendicular to the primary axis. The Y axis (Normal) is defined as Z cross X.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HG">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Heliographic - A heliocentric rotating coordinate system where the Z axis is normal to the solar equatorial plane, positive northward. X, Y axes rotate with a 25.38 day period. The zero longitude (X axis) is defined as the longitude that passed through the ascending node of the solar equator on the ecliptic plane on 1 January, 1854 at 12 UT. See &lt;http://nssdc.gsfc.nasa.gov/space/helios/coor_des.html&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HGI">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Heliographic Inertial - A heliocentric coordinate system where the Z axis is normal to the solar equatorial plane, positive northward. X axis is along the intersection line between solar equatorial and ecliptic planes. The X axis was positive at SE longitude of 74.367 deg on Jan 1, 1900. (See SE below.) See &lt;http://nssdc.gsfc.nasa.gov/space/helios/coor_des.html&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HGRTN">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Heliocentric Radial Tangential Normal coordinate system (aka RTN). Typically centered at a spacecraft. Used for IMF and plasma V vectors. The X axis (radial) is set as the primary axis, and is defined as the axis pointing from the spacecraft to the Sun. The Z axis (tangential) is set as the secondary axis, and is defined as that portion of the solar North rotational axis which is perpendicular to the primary axis. The Y axis (normal) is defined as Z cross X.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HPC">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Helioprojective Cartesian = A 3-D orthonormal (left-handed) coordinate system that is primarily intended to specify with two dimensions a point on the solar disk. The Z axis points from the observer to the center of the solar disk. The Y axis lies in the plane defined by the solar spin vector and the Z axis, positive northward. The X axis is perpendicular to the Y and Z axes, positive toward solar west. Given as the distance between the observer and the center of the solar disk, the standard representation of an (x,y) point on the solar disk is via the point&#39;s longitude angle [arctan (x/d)] and latitude angle [arctan y/d].
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HPR">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Helioprojective Radial - A 3-D orthonormal (left-handed) coordinate system that is primarily intended to specify with two dimensions a point on the solar disk. The Z axis points from the observer to the center of the solar disk. The Y axis lies in the plane defined by the solar spin vector and the Z axis, positive northward. The X axis is perpendicular to the Y and Z axes, positive toward solar west. Given as the distance between the observer and the center of the solar disk, the standard representation for this system of an (x,y) point on the solar disk is via the point&#39;s latitude angle theta {= arctan [SQRT(x**2 + y**2)]/d]} or equivalent declination parameter delta (= theta - 90 deg), and its phase angle psi as measured counter- clockwise from the +Y axis [psi = arctan (-y/x)].
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HSM">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Heliospheric Solar Magnetospheric - A coordinate system where the X axis is from Earth to Sun, Z axis is northward in a plane containing the X axis and the geomagnetic dipole axis.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="J2000">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An astronomical coordinate system which uses the mean equator and equinox of Julian date 2451545.0 TT (Terrestrial Time), or January 1, 2000, noon TT. (aka J2000) to define a celestial reference frame.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="JSM">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Jovian Solar Magnetospheric - A coordinate system related to Jupiter where the X axis is from Jupiter to Sun, Z axis is northward in a plane containing the X axis and the Jovian dipole axis.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="JSO">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Jovian Solar Orbital - A coordinate system related to Jupiter where X anti-sunward, Y along the orbital velocity direction.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="KSM">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Kronian Solar Magnetospheric - A coordinate system related to Saturn where the X axis is anti-sunward, Z axis is northward in a plane containing the X axis and the Kronian dipole axis.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="KSO">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Kronian Solar Orbital - A coordinate system related to Saturn where X is anti-sunward, Y along the orbital velocity direction.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="LGM">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Local Geomagnetic - A coordinate system used mainly for Earth surface or near Earth surface magnetic field data. X axis northward from observation point in a geographic meridian. Z axis downward towards Earth&#39;s center. In this system, H (total horizontal component) = SQRT (Bx^2 + By^2) and D (declination angle) = arctan (By/Bx)
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MAG">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Geomagnetic - geocentric. Z axis is parallel to the geomagnetic dipole axis, positive north. X is in the plane defined by the Z axis and the Earth&#39;s rotation axis. If N is a unit vector from the Earth&#39;s center to the north geographic pole, the signs of the X and Y axes are given by Y = N x Z, X = Y x Z.. See Russell, 1971, and &lt;http://cdpp.cnes.fr/00428.pdf&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MFA">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Magnetic Field Aligned - A coordinate system spacecraft-centered system with Z in the direction of the ambient magnetic field vector. X is in the plane defined by Z and the spacecraft-Sun line, positive sunward. See &lt;http://cdpp.cnes.fr/00428.pdf&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MSO">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Mars/Mercury Solar Orbital A coordinate system related to Mars or Mercury. A coordinate system where, depending on the body (Mars or Mercury), X is anti-sunward, Y along the orbital velocity direction.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="RTN">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Radial Tangential Normal. Typically centered at a spacecraft. Used for IMF and plasma V vectors. The X axis (radial) is set as the primary axis, and is defined as the axis pointing from the spacecraft to the Sun. The Z axis (tangential) is set as the secondary axis, and is defined as that portion of the solar North rotational axis which is perpendicular to the primary axis. The Y axis (normal) is defined as Z cross X.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SC">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Spacecraft - A coordinate system defined by the spacecraft geometry and/or spin. Often has Z axis parallel to spacecraft spin vector. X and Y axes may or may not corotate with the spacecraft. See SR and SR2 below.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SE">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Solar Ecliptic - A heliocentric coordinate system where the Z axis is normal to the ecliptic plane, positive northward. X axis is positive towards the first point of Aries (from Earth to Sun at vernal equinox). Same as HAE above. See &lt;http://nssdc.gsfc.nasa.gov/space/helios/coor_des.html&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SM">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Solar Magnetic - A geocentric coordinate system where the Z axis is northward along Earth&#39;s dipole axis, X axis is in plane of z axis and Earth-Sun line, positive sunward. See Russell, 1971.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SpacecraftOrbitPlane">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A coordinate system where X lies in the plane normal to and in the direction of motion of the spacecraft, Z is normal to this plane and Y completes the triad in a right-handed coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SR">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Spin Reference - A special case of a Spacecraft (SC) coordinate system for a spinning spacecraft. Z is parallel to the spacecraft spin vector. X and Y rotate with the spacecraft. See &lt;http://cdpp.cnes.fr/00428.pdf&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SR2">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Spin Reference 2 - A special case of a Spacecraft (SC) coordinate system for a spinning spacecraft. Z is parallel to the spacecraft spin vector. X is in the plane defined by Z and the spacecraft-Sun line, positive sunward. See &lt;http://cdpp.cnes.fr/00428.pdf&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SSE">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Spacecraft Solar Ecliptic - A coordinate system used for deep space spacecraft, for example Helios. - X axis from spacecraft to Sun. Z axis normal to ecliptic plane, positive northward. Note: Angle between normals to ecliptic and to Helios orbit plane ~ 0.25 deg.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SSE_L">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Selenocentric Solar Ecliptic.  The X axis points from the center of the Earth&#39;s moon to the sun, the Z axis is normal to the ecliptic plane, positive northward.  And the Y axis completes the right-handed set of axes.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="TIIS">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Kronian Solar Orbital - A coordinate system related to Saturn where X is anti-sunward, Y along the orbital velocity direction.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="VSO">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Venus Solar Orbital - A coordinate system related to Venus where X is anti-sunward, Y along the orbital velocity direction.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="WGS84">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The World Geodetic System (WGS) defines a reference frame for the earth, for use in geodesy and navigation. The WGS84 uses the zero meridian as defined by the Bureau International de l&#39;Heure.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: DirectionAngle

     Identifiers for the angle between a vector and a base axis.
     ========================== -->
   <xsd:simpleType name="DirectionAngle">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the angle between a vector and a base axis.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="AzimuthAngle">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The angle between the projection into the i-j plane of a position or measured vector and the i-axis of the coordinate system. Mathematically defined as arctan(j/i). This term could be also applied to angles measured in different planes, for example the IMF clock angle defined as arctan(|By|/Bz). 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ElevationAngle">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The angle between the position or measured vector and the i-j plane of the coordinate system. Mathematically defined as arctan(k/SQRT(i^2+j^2)).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PolarAngle">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The angle between the position or measured vector and the k-axis of the coordinate system. Mathematically defined as arctan([SQRT(i^2+j^2)]/k). This term could be also applied to angles between the vector and other components, for example the IMF cone angle defined as arccos(Bx/Bt).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: DirectionCosine

     Identifiers for the cosine of the angle between two vectors in a three dimensional Euclidean space.
     ========================== -->
   <xsd:simpleType name="DirectionCosine">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the cosine of the angle between two vectors in a three dimensional Euclidean space.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="I">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Projection of a vector along the first named axis of a coordinate system. Typically the X axis, but could be the R axis for an RTN coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="J">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Projection of a vector along the second named axis of a coordinate system. Typically the Y axis, but could be the T axis for an RTN coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="K">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Projection of a vector along the third named axis of a coordinate system. Typically the Z axis, but could be the N axis for an RTN coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: DisplayType

     Identifiers for types or classes of rendered data.
     ========================== -->
   <xsd:simpleType name="DisplayType">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for types or classes of rendered data.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Image">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A two-dimensional representation of data with values at each element of the array related to an intensity or a color.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Plasmagram">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The characterization of signal strengths in active sounding measurements as a function of virtual range or signal delay time and sounding frequency. A Plasmagram is also referred to as an Ionogram.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Spectrogram">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The characterization of signal strengths as a function of frequency (or energy) and time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="StackPlot">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A representation of data showing multiple sets of observations on a single plot, possibly offsetting each plot by some uniform amount.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="TimeSeries">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A representation of data showing a set of observations taken at different points in time and charted as a time series.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="WaveForm">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Spatial or temporal variations of wave amplitude over wave-period timescales.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: DocumentType

     Identifiers for the characterization of the content or purpose of a document.
     ========================== -->
   <xsd:simpleType name="DocumentType">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the characterization of the content or purpose of a document.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Convention">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A set of agreed, stipulated, or generally accepted approaches or methods of adopting a standard or implementing a approach. 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Other">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Not classified with more specific terms. The context of its usage may be described in related text.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Policy">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A deliberate system of principles to guide decisions and achieve rational outcomes. A policy is a statement of intent, and is implemented as a procedure or protocol.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Poster">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A set of information arranged on a single page or sheet, typically in a large format.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Presentation">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A set of information that is used when communicating to an audience.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Report">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A document which describes the findings of some individual or group.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Specification">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A detailed description of the requirements and other aspects of an object or component that may be used to develop an implementation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="TechnicalNote">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A document summarizing the performance and other technical characteristics of a product, machine, component, subsystem or software in sufficient detail to be used by an engineer or researcher.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="WhitePaper">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An authoritative report giving information or proposals on an issue.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Earth

     Identifiers for the regions surrounding the Earth.
     ========================== -->
   <xsd:simpleType name="Earth">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the regions surrounding the Earth.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Magnetosheath">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region between the bow shock and the magnetopause, characterized by very turbulent plasma.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Magnetosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Magnetotail">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Main">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Plasmasphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Polar">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RadiationBelt">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RingCurrent">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Moon">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The only natural satellite of the Earth.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="NearSurface">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The gaseous and possibly ionized environment of a body extending from the surface to some specified altitude. For the Earth, this altitude is 2000 km.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="NearSurface.Atmosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The neutral gases surrounding a body that extends from the surface and is bound to the body by virtue of the gravitational attraction.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="NearSurface.AuroralRegion">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region in the atmospheric where electrically-charged particles bombarding the upper atmosphere of a planet in the presence of a magnetic field produce an optical phenomenon.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="NearSurface.EquatorialRegion">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A region centered on the equator and limited in latitude by approximately 23 degrees north and south of the equator.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="NearSurface.Ionosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The charged or ionized gases surrounding a body that are nominally bound to the body by virtue of the gravitational attraction.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
                  <xsd:enumeration value="NearSurface.Ionosphere.DRegion">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The layer of the ionosphere that exists approximately 50 to 95 km above the surface of the Earth. One of several layers in the ionosphere.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="NearSurface.Ionosphere.ERegion">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        A layer of ionised gas occurring at 90-150km above the ground. One of several layers in the ionosphere. Also called the The Kennelly-Heaviside layer.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="NearSurface.Ionosphere.FRegion">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        A layer that contains ionized gases at a height of around 150-800 km above sea level, placing it in the thermosphere. the F region has the highest concentration of free electrons and ions anywhere in the atmosphere. It may be thought of as comprising two layers, the F1-and F2-layers. One of several layers in the ionosphere. Also known as the Appleton layer.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="NearSurface.Ionosphere.Topside">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region at the upper most areas of the ionosphere.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
               <xsd:enumeration value="NearSurface.Mesosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The layer of the atmosphere that extends from the Stratosphere to a range of 80 km to 85 km, temperature decreasing with height.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="NearSurface.MidLatitudeRegion">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     When considering the case of the Earth, the mid-latitude region typically refers to two latitudinal bands, one in the northern hemisphere and the other in the southern hemisphere extending from about 23 degrees to 50 degrees. The concept of mid-latitude regions does not apply to all bodies in the solar system and different latitudinal ranges would apply for each body case by case. The mid-latitude regions may be defined by using either planetographic or magnetic coordinates if the magnetic dipole is closely aligned with the spin axis of a magnetized body. Ground magnetometers located at mid latitude on the Earth are well positioned to measure magnetic storm-time ring current variations.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="NearSurface.Plasmasphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="NearSurface.PolarCap">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The areas of the globe surrounding the poles and consisting of the region north of 60 degrees north latitude an the region south of 60 degrees south latitude.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="NearSurface.SouthAtlanticAnomalyRegion">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region where the Earth&#39;s inner van Allen radiation belt makes its closest approach to the planet&#39;s surface. The result is that, for a given altitude, the radiation intensity is higher over this region than elsewhere.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="NearSurface.Stratosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The layer of the atmosphere that extends from the troposphere to about 30 km, temperature increases with height. The stratosphere contains the ozone layer.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="NearSurface.SubAuroralRegion">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     When considering the case of the Earth, the sub-auroral region typically refers to two latitudinal bands, one in the northern hemisphere and the other in the southern hemisphere extending from about 50 degrees to low 60 degrees. The concept sub-auroral regions does not apply to all bodies in the solar system and different latitudinal ranges would apply for each body case by case. The sub-auroral regions may be defined by using either planetographic or magnetic coordinates if the magnetic dipole is closely aligned with the spin axis of a magnetized body. Ground magnetometers located at sub-auroral latitudes on the Earth measure a mixture of activity driven by auroral zone currents and the ring current.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="NearSurface.Thermosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The layer of the atmosphere that extends from the Mesosphere to 640+ km, temperature increasing with height.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="NearSurface.Troposphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The lowest layer of the atmosphere which begins at the surface and extends to between 7 km (4.4 mi) at the poles and 17 km (10.6 mi) at the equator, with some variation due to weather factors.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Surface">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The outermost area of a solid object.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Encoding

     Identifiers for unambiguous rules that establishes the representation of information within a file.
     ========================== -->
   <xsd:simpleType name="Encoding">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for unambiguous rules that establishes the representation of information within a file.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="ASCII">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A sequence of characters that adheres to American Standard Code for Information Interchange (ASCII) which is an 7-bit character-coding scheme.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Base64">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A data encoding scheme whereby binary-encoded data is converted to printable ASCII characters. It is defined as a MIME content transfer encoding for use in Internet e-mail. The only characters used are the upper- and lower-case Roman alphabet characters (A-Z, a-z), the numerals (0-9), and the &quot;&quot;+&quot;&quot; and &quot;&quot;/&quot;&quot; symbols, with the &quot;&quot;=&quot;&quot; symbol as a special suffix (padding) code.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="BZIP2">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An open standard algorithm by Julian Seward using Burrows-Wheeler block sorting and Huffman coding. See &lt;http://www.bzip.org/&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GZIP">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An open standard algorithm distributed by GHU based on LZ77 and Huffman coding. See &lt;http://www.gnu.org/software/gzip/gzip.html&gt; or &lt;http://www.gzip.org/&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="None">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A lack or absence of anything.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="S3_BUCKET">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A container of objects that comply with the Amazon Simple Storage Service (S3) specifications. A bucket has a unique, user-assigned key (name). A bucket can contain any number of objects with an aggregate size of 5 gigabytes. A bucket may be accompanied by up to 2 kilobytes of metadata.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="TAR">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A file format used to collate collections of files into one larger file, for distribution or archiving, while preserving file system information such as user and group permissions, dates, and directory structures. The format was standardized by POSIX.1-1988 and later POSIX.1-2001.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Unicode">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Text in multi-byte Unicode format.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ZIP">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An open standard for compression which is a variation of the LZW method and was originally used in the PKZIP utility.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: FieldQuantity

     Identifiers for the physical attribute of the field.
     ========================== -->
   <xsd:simpleType name="FieldQuantity">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the physical attribute of the field.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Current">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The flow of electrons through a conductor caused by a potential difference.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Electric">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The physical attribute that exerts an electrical force.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Electromagnetic">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Electric and magnetic field variations in time and space that propagate through a medium or a vacuum with the wave&#39;s propagation, electric field, and magnetic field vectors forming an orthogonal triad. Waves in this category are detected by having their field quantities measured.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Gyrofrequency">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The number of gyrations around a magnetic guiding center (field line) a charged particle makes per unit time due to the Lorentz force.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Magnetic">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The physical attribute attributed to a magnet or its equivalent.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PlasmaFrequency">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A number-density-dependent characteristic frequency of a plasma.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Potential">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The work required per unit charge to move a charge from a reference point to a point at infinity (electric potential is defined to be zero). The electric potential of a spacecraft is often referred to as the &quot;&quot;spacecraft potential&quot;&quot;. The spacecraft potential is the electric potential of the spacecraft relative to the potential of the nearby plasma. The spacecraft potential is non-zero because the spacecraft charges to the level that the emitted photoelectron flux going to infinity is balanced by the plasma electron flux to the spacecraft. 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PoyntingFlux">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Electromagnetic energy flux transported by a wave characterized as the rate of energy transport per unit area per steradian.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Format

     Identifiers for data organized according to preset specifications.
     ========================== -->
   <xsd:simpleType name="Format">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for data organized according to preset specifications.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="AVI">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Audio Video Interleave (AVI) a digital format for movies that conforms to the Microsoft Windows Resource Interchange File Format (RIFF).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Binary">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A direct representation of the bits which may be stored in memory on a computer.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CDF">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Common Data Format (CDF). A binary storage format developed at Goddard Space Flight Center (GSFC).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CEF">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Cluster Exchange Format (CEF) is a self-documenting ASCII format designed for the exchange of data. There are two versions of CEF which are not totally compatible.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CEF1">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Cluster Exchange Format (CEF), version 1, is a self-documenting ASCII format designed for the exchange of data. The metadata contains information compatible with the ISTP recommendations for CDF.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CEF2">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Cluster Exchange Format (CEF), version 2, is a self-documenting ASCII format designed for the exchange of data and introduced for Cluster Active Archive. Compared to version 1, the metadata description of vectors and tensors is different.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CSV">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Comma Separated Value - A data exchange format defined by RFC 4180.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Excel">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A Microsoft spreadsheet format used to hold a variety of data in tables which can include calculations.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="FITS">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Flexible Image Transport System (FITS) is a digital format primarily designed to store scientific data sets consisting of multi-dimensional arrays (1-D spectra, 2-D images or 3-D data cubes) and 2-dimensional tables containing rows and columns of data.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GIF">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Graphic Interchange Format (GIF) first introduced in 1987 by CompuServe. GIF uses LZW compression and images are limited to 256 colours.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Hardcopy">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A permanent reproduction, or copy in the form of a physical object, of any media suitable for direct use by a person.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Hardcopy.Film">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     An image recording medium on which usually a &quot;&quot;negative&quot;&quot; analog image is registered. A &quot;&quot;positive&quot;&quot; image can be recovered or reproduced from film, which is usually made of flexible materials for ease of storage and transportation.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Hardcopy.Microfiche">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A sheet of microfilm on which many pages of material have been photographed; a magnification system is used to read the material.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Hardcopy.Microfilm">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Film rolls on which materials are photographed at greatly reduced size; a magnification system is used to read the material.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Hardcopy.Photograph">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     An image (positive or negative) registered on a piece of photo-sensitive paper
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Hardcopy.PhotographicPlate">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A rigid (typically glass) medium that functions like film. Its rigidity is for guarding against image distortion due to medium deformation (caused by heat and humidity). Photographic plates are often used for astronomical photography.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Hardcopy.Print">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A sheet of any written or printed material which may include notes or graphics. Multiple printed pages may be bound into a manuscript or book.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="HDF">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Hierarchical Data Format
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HDF4">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Hierarchical Data Format, Version 4
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HDF5">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Hierarchical Data Format, Version 5
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HTML">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A text file containing structured information represented in the HyperText Mark-up Language (HTML). See &lt;http://www.w3.org/MarkUp/&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="IDFS">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Instrument Data File Set (IDFS) is a set of files written in a prescribed format which contain data, timing data, and meta-data. IDFS was developed at Southwest Research Institute (SwRI).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="IDL">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Interactive Data Language (IDL) save set. IDL is a proprietary format.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="JPEG">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A binary format for still images defined by the Joint Photographic Experts Group
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="JSON">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Javascript Object Notation - A lightweight data-interchange format.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MATLAB_4">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  MATLAB Workspace save set, version 4. MAT-files are double-precision, binary, MATLAB format files. MATLAB is a proprietary product of The MathWorks.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MATLAB_6">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  MATLAB Workspace save set, version 6. MAT-files are double-precision, binary, MATLAB format files. MATLAB is a proprietary product of The MathWorks.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MATLAB_7">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  MATLAB Workspace save set, version 7. MAT-files are double-precision, binary, MATLAB format files. Version 7 includes data compression and Unicode encoding. MATLAB is a proprietary product of The MathWorks.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MPEG">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A digital format for movies defined by the Motion Picture Experts Group
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="NCAR">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The National Center for Atmospheric Research (NCAR) format. A complete description of that standard is given in appendix C of the &quot;&quot;Report on Establishment &amp; Operation of the Incoherent- Scatter Data Base&quot;&quot;, dated August 23, 1984, obtainable from NCAR, P.O. Box 3000 Boulder, Colorado 80307-3000.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="NetCDF">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Unidata Program Center&#39;s Network Common Data Form (NetCDF). A self-describing portable data format for array-oriented data access. See &lt;http://my.unidata.ucar.edu/content/software/netcdf&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PDF">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A document expressed in the Portable Document Format (PDF) as defined by Adobe.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PDS4">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The Planetary Data System, version 4 (PDS4) standard provides guidelines on how a data producer should construct a data set suitable for long-term archiving. The standard contains a number of requirements in terms of dataset structure and documentation that should allow for any PDS compliant data set to be used and understood in the long term. Each PDS4 bundle consists of two files, one containing the data and the other an eXtensible Markup Language (XML) file containing the label. PDS4 recognises four base data structures, array, table, parsable byte stream and encoded byte stream with arrays and tables most commonly in use. The PDS4 standard is described at: https://pds.jpl.nasa.gov/datastandards/documents/current-version.shtml. The PDS4 archiving standard has been required for data archives from NASA-funded planetary missions and for small data archives since 2011.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PDS3">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The. Planetary Data System, version 3 (PDS3) standard provides guidelines on how a data producer should construct a data set suitable for long-term archiving. The standard contains a number of requirements in terms of dataset structure and documentation that should allow for any PDS compliant data set to be used and understood in the long term. Each PDS3 data product must be labelled in ASCII with full details on the structure and content of the product. The label can be attached to the data file itself or detached in a separate &#39;label&#39; file with the suffix LBL. The PDS3 standard is described at: https://pds.jpl.nasa.gov/datastandards/pds3/standards/ Since 2011, PDS3 has superseded by the PDS4 archiving standard. However, many data files still exist that are stored by using the PDS3 standard.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PNG">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A digital format for still images. Portable Network Graphics (PNG)
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Postscript">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A page description programming language created by Adobe Systems Inc. that is a device-independent industry standard for representing text and graphics.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="QuickTime">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A format for digital movies, as defined by Apple Computer. See &lt;http://developer.apple.com/quicktime/&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Text">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A sequence of characters which may have an imposed structure or organization.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Text.ASCII">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A sequence of characters that adheres to American Standard Code for Information Interchange (ASCII) which is an 7-bit character-coding scheme.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Text.Unicode">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Text in multi-byte Unicode format.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="TIFF">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A binary format for still pictures. Tagged Image Format File (TIFF). Originally developed by Aldus and now controlled by Adobe.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="UDF">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Universal Data Format (UDF). The Optical Technology Storage Association&#39;s Universal Disk Format, based on ISO 13346. See &lt;http://www.osta.org/specs/index.htm&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="VOTable">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A proposed IVOA standard designed as a flexible storage and exchange format for tabular data.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="XML">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  eXtensible Mark-up Language (XML). A structured format for representing information. See &lt;http://www.w3.org/XML/&gt;
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Hardcopy

     Identifiers for permanent reproductions, or copy in the form of a physical object, of any media suitable for direct use by a person.
     ========================== -->
   <xsd:simpleType name="Hardcopy">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for permanent reproductions, or copy in the form of a physical object, of any media suitable for direct use by a person.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Film">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An image recording medium on which usually a &quot;&quot;negative&quot;&quot; analog image is registered. A &quot;&quot;positive&quot;&quot; image can be recovered or reproduced from film, which is usually made of flexible materials for ease of storage and transportation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Microfiche">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A sheet of microfilm on which many pages of material have been photographed; a magnification system is used to read the material.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Microfilm">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Film rolls on which materials are photographed at greatly reduced size; a magnification system is used to read the material.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Photograph">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An image (positive or negative) registered on a piece of photo-sensitive paper
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PhotographicPlate">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A rigid (typically glass) medium that functions like film. Its rigidity is for guarding against image distortion due to medium deformation (caused by heat and humidity). Photographic plates are often used for astronomical photography.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Print">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A sheet of any written or printed material which may include notes or graphics. Multiple printed pages may be bound into a manuscript or book.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: HashFunction

     Identifiers for functions or algorithms that convert a digital data object into a hash value.
     ========================== -->
   <xsd:simpleType name="HashFunction">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for functions or algorithms that convert a digital data object into a hash value.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="MD5">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Message Digest 5 (MD5) is a 128-bit message digest algorithm created in 1991 by Professor Ronald Rivest.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SHA1">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Secure Hash Algorithm (SHA), a 160-bit message digest algorithm developed by the NSA and described in Federal Information Processing Standard (FIPS) publication 180-1.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SHA256">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Secure Hash Algorithm (SHA), a 256-bit message digest algorithm developed by the NSA and described in Federal Information Processing Standard (FIPS) publication 180-1.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Heliosphere

     Identifiers for regions of the solar atmosphere which extends roughly from the inner corona to the edge of the solar plasma at the heliopause separating primarily solar plasma from interstellar plasma.
     ========================== -->
   <xsd:simpleType name="Heliosphere">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for regions of the solar atmosphere which extends roughly from the inner corona to the edge of the solar plasma at the heliopause separating primarily solar plasma from interstellar plasma.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Heliosheath">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region extending radially outward from the heliospheric termination shock and in which the decelerated solar wind plasma is still significant.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Inner">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region of the heliosphere extending radially outward from the solar coronal base to just inside 1 AU.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="NearEarth">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The heliospheric region near the Earth which extends to and includes the area near the L1 and L2 Lagrange point.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Outer">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region of the heliosphere extending radially outward from just outside 1 AU to the heliospheric termination shock.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Remote1AU">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A roughly toroidal region that includes the Earth&#39;s orbit, but exclusive of the region near the Earth.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: InstrumentType

     Identifiers for the type of experiment the instrument performs. This is the technique of observation.
     ========================== -->
   <xsd:simpleType name="InstrumentType">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the type of experiment the instrument performs. This is the technique of observation.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Antenna">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A sensor used to measure electric potential.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Channeltron">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument that detects electrons, ions, and UV-radiation, according to the principle of a secondary emission multiplier. It is typically used in electron spectroscopy and mass spectrometry.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Coronograph">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which can image things very close to the Sun by using a disk to block the Sun&#39;s bright surface which reveals the faint solar corona and other celestial objects.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="DoubleSphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A dipole antenna of which the active (sensor) elements are small spheres located at the ends of two wires deployed in the equatorial plane, on opposite sides of a spinning spacecraft.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="DustDetector">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which determines the mass and speed of ambient dust particles.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ElectronDriftInstrument">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An active experiment to measure the electron drift velocity based on sensing the displacement of a weak beam of electrons after one gyration in the ambient magnetic field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ElectrostaticAnalyser">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which uses charged plates to analyze the mass, charge and kinetic energies of charged particles which enter the instrument.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="EnergeticParticleInstrument">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument that measures fluxes of charged particles as a function of time, direction of motion, mass, charge and/or species.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Experiment">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A collection of components which are designed to make coordinated observations of a phenomenon or object. Projects and missions may refer to an &#39;experiment&#39; by other names like &#39;suite&#39;. 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="FaradayCup">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument consisting of an electrode from which electrical current is measured while a charged particle beam (electrons or ions) impinges on it. Used to determine energy spectrum and sometimes ion composition of the impinging particles.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="FluxFeedback">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A search coil whose bandwidth and signal/noise ratio are increased by the application of negative feedback at the sensor (flux) level by driving a collocated coil with a signal from the preamplifier.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="FourierTransformSpectrograph">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument that determines the spectra of a radiative source, using time-domain measurements and a Fourier transform.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GeigerMuellerTube">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which measures density of ionizing radiation based on interactions with a gas.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Imager">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which samples the radiation from an area at one or more spectral ranges emitted or reflected by an object.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ImagingSpectrometer">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which is a multispectral scanner with a very large number of channels (64-256 channels) with very narrow band widths.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Interferometer">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument to study the properties of two or more waves from the pattern of interference created by their superposition.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="IonChamber">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A device in which the collected electrical charge from ionization in a gas-filled cavity is taken to be the proportion to some parameter (e.g. dose or exposure) of radiation field
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="IonDrift">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A device which measures the current produced by the displacement of ambient ions on a grid, thereby allowing the determination of the ion trajectory and velocity.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="IonGauge">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A device which measures low-pressure or vacuum neutral gas with pressures ranging from 10e-3 Torr to 10e?10 Torr. An ion gauge is an electronic amplifying vacuum tube consisting of three electrodes inside an evacuated glass envelope, with the filament being the cathode.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="LangmuirProbe">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A monopole antenna associated with an instrument. The instrument applies a potential to the antenna which is swept to determine the voltage/current characteristic. This provides information about the plasma surrounding the probe and spacecraft.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="LongWire">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A dipole antenna whose active (sensor) elements are two wires deployed in the equatorial plane on opposite sides of a spinning spacecraft, and whose length is several times greater than the spacecraft diameter.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Magnetograph">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A special type of magnetometer that records a time plot of the local magnetic field near the instrument; or a telescope capable of determining the magnetic field strength and/or direction on a distant object such as the Sun, using the Zeeman splitting or other spectral signatures of magnetization.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Magnetometer">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which measures the ambient magnetic field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MassSpectrometer">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which distinguishes chemical species in terms of their different isotopic masses.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MicrochannelPlate">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument used for the detection of elementary particles, ions, ultraviolet rays and soft X-rays constructed from very thin conductive glass capillaries.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MultispectralImager">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which captures images at multiple spectral ranges.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="NeutralAtomImager">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which measures the quantity and properties of neutral particles over a range of angles. Measured properties can include mass and energy.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="NeutralParticleDetector">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which measures the quantity and properties of neutral particles. Measured properties can include mass and plasma bulk densities.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ParticleCorrelator">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which correlates particle flux to help identify wave/particle interactions.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ParticleDetector">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which detects particle flux!!!
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Photometer">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which measures the strength of electromagnetic radiation within a spectral band which can range from ultraviolet to infrared and includes the visible spectrum.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PhotomultiplierTube">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A vacuum phototube that is an extremely sensitive detector of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Photopolarimeter">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which measures the intensity and polarization or radiant energy. A photopolarimeter is a combination of a photometer and a polarimeter.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Platform">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A compulsory or necessary condition.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ProportionalCounter">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which measures energy of ionization radiation based on interactions with a gas.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="QuadrisphericalAnalyser">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument used for the 3-D detection of plasma, energetic electrons and ions, and for positive-ion composition measurements.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Radar">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument that uses directional properties of returned power to infer spatial and/or other characteristics of a remote object.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Radiometer">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument for detecting or measuring radiant energy. Radiometers are commonly limited to infrared radiation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ResonanceSounder">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A combination of a radio receiver and a pulsed transmitter used to study the plasma surrounding a spacecraft by identifying resonances or cut-offs (of the wave dispersion relation), whose frequencies are related to the ambient plasma density and magnetic field. When the transmitter is off it is essentially a high frequency-resolution spectral power receiver.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="RetardingPotentialAnalyser">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which measures ion temperatures and ion concentrations using a planar ion trap.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Riometer">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which measure the signal strength in various directions of the galactic radio signals. Variations in these signals are influenced by solar flare activity and geomagnetic storm and substorm processes.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ScintillationDetector">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which detects flouresences of a material which is excited by high energy (ionizing) electromagnetic or charged particle radiation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SearchCoil">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which measures the time variation of the magnetic flux threading a loop by measurement of the electric potential difference induced between the ends of the wire.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SolidStateDetector">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A detector of the charge carriers (electrons and holes) generated in semiconductors by energy deposited by gamma ray photons. Also known as a &quot;&quot;semiconductor detector&quot;&quot;.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Sounder">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which measures the radiances from an object. A sounder may measure radiances at multiple spectral ranges.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SpacecraftPotentialControl">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument to control the electric potential of a spacecraft with respect to the ambient plasma by emitting a variable current of positive ions.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SpectralPowerReceiver">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A radio receiver which determines the power spectral density of the electric or magnetic field, or both, at one or more frequencies.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Spectrometer">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument that measures the component wavelengths of light (or other electromagnetic radiation) by splitting the light up into its component wavelengths.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="TimeOfFlight">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An instrument which measures the time it takes for a particle to travel between two detectors.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Unspecified">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A value which is not provided.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="WaveformReceiver">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A radio receiver which outputs the value of one or more components of the electric and/or magnetic field as a function of time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Integral

     Identifiers for values above a given threshold and over area or solid-angle range.
     ========================== -->
   <xsd:simpleType name="Integral">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for values above a given threshold and over area or solid-angle range.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Area">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Integration over the extent of a planar region, or of the surface of a solid.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Bandwidth">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Integration over the width a frequency band.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SolidAngle">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Integration over the angle in three-dimensional space that an object subtends at a point.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Ionosphere

     Identifiers for ionospheric regions.
     ========================== -->
   <xsd:simpleType name="Ionosphere">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for ionospheric regions.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="DRegion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The layer of the ionosphere that exists approximately 50 to 95 km above the surface of the Earth. One of several layers in the ionosphere.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ERegion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A layer of ionised gas occurring at 90-150km above the ground. One of several layers in the ionosphere. Also called the The Kennelly-Heaviside layer.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="FRegion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A layer that contains ionized gases at a height of around 150-800 km above sea level, placing it in the thermosphere. the F region has the highest concentration of free electrons and ions anywhere in the atmosphere. It may be thought of as comprising two layers, the F1-and F2-layers. One of several layers in the ionosphere. Also known as the Appleton layer.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Topside">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region at the upper most areas of the ionosphere.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Jupiter

     Identifiers for the regions surrounding the planet Jupiter.
     ========================== -->
   <xsd:simpleType name="Jupiter">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the regions surrounding the planet Jupiter.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Callisto">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A second largest moon of Jupiter and the third-largest moon in the solar system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Europa">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The sixth-closest round moon of Jupiter.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Ganymede">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The biggest moon of Jupiter and in the solar system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Io">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The innermost of the four round moons of the planet Jupiter.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Magnetosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Magnetotail">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Main">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Plasmasphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Polar">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RadiationBelt">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RingCurrent">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Magnetosphere

     Identifiers for the region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of planet's magnetic field.
     ========================== -->
   <xsd:simpleType name="Magnetosphere">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of planet&#39;s magnetic field.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Magnetotail">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Main">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Plasmasphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Polar">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="RadiationBelt">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="RingCurrent">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Mars

     Identifiers for the regions surrounding the planet Mars.
     ========================== -->
   <xsd:simpleType name="Mars">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the regions surrounding the planet Mars.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Deimos">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The smaller and outermost of the two natural satellites of Mars.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Magnetosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Magnetotail">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Main">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Plasmasphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Polar">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RadiationBelt">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RingCurrent">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Phobos">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The larger and inner most moon of Mars.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: MeasurementType

     Identifiers for the method of making an estimated value of a quantity that forms the basis of an observation.
     ========================== -->
   <xsd:simpleType name="MeasurementType">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the method of making an estimated value of a quantity that forms the basis of an observation.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="ActivityIndex">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An indication, derived from one or more measurements, of the level of activity of an object or region, such as sunspot number, F10.7 flux, Dst, or the Polar Cap Indices.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Dopplergram">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A map or image depicting the spatial distribution of line-of-sight velocities of the observed object.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Dust">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Free microscopic particles of solid material.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ElectricField">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A region of space around a charged particle, or between two voltages within which a force is exerted on charged objects in its vicinity. An electric field is the electric force per unit charge.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="EnergeticParticles">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Pieces of matter that are moving very fast. Energetic particles include protons, electrons, neutrons, neutrinos, the nuclei of atoms, and other sub-atomic particles.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Ephemeris">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The spatial coordinates of a body as a function of time. When used as an Instrument Type it represents the process or methods used to generate spatial coordinates.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ImageIntensity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Measurements of the two-dimensional distribution of the intensity of photons from some region or object such as the Sun or the polar auroral regions; can be in any wavelength band, and polarized, etc.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="InstrumentStatus">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A quantity directly related to the operation or function of an instrument.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="IonComposition">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  In situ measurements of the relative flux or density of electrically charged particles in the space environment. May give simple fluxes, but full distribution functions are sometimes measured.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Irradiance">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Irradiance - A radiometric term for the power of electromagnetic radiation at a surface, per unit area. &quot;&quot;Irradiance&quot;&quot; is used when the electromagnetic radiation is incident on the surface.  Irradiance data may be reported in any units (i.e. counts/s) due to, for example, being at a particular wavelength, or to being a not-fully-calibrated relative measurement.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MagneticField">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A region of space near a magnetized body where magnetic forces can be detected (as measured by methods such as Zeeman splitting, etc.).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Magnetogram">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Measurements of the vector or line-of-sight magnetic field determined from remote sensing measurements of the detailed structure of spectral lines, including their splitting and polarization. (&quot;&quot;Magnetogram.&quot;&quot;)
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="NeutralAtomImages">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Measurements of neutral atom fluxes as a function of look direction; often related to remote energetic charged particles that lose their charge through charge-exchange and then reach the detector on a line-of-sight trajectory.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="NeutralGas">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Measurements of neutral atomic and molecular components of a gas.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Profile">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Measurements of a quantity as a function of height above an object such as the limb of a body.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Radiance">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A radiometric measurement that describes the amount of electromagnetic radiation that passes through or is emitted from a particular area, and falls within a given solid angle in a specified direction. They are used to characterize both emission from diffuse sources and reflection from diffuse surfaces.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Spectrum">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The distribution of a characteristic of a physical system or phenomenon, such as the energy emitted by a radiant source, arranged in the order of wavelengths.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SPICE">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  SPICE is an ancillary information system that provides scientists and engineers the capability to include space geometry and event data into mission design, science observation planning, and science data analysis software. The staff of the NASA Navigation and Ancillary Information Facility, NAIF, which is located at JPL provides SPICE support for planetary, heliophysics, and Earth science missions, see https://naif.jpl.nasa.gov/naif/index.html. This SPICE has been adapted from text on NAF hosted web pages.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ThermalPlasma">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Measurements of the plasma in the energy regime where the most of the plasma occurs. May be the basic fluxes in the form of distribution functions or the derived bulk parameters (density, flow velocity, etc.).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Waves">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Data resulting from observations of wave experiments and natural wave phenomena. Wave experiments are typically active and natural wave phenomena are passive. Examples of wave experiments include coherent/incoherent scatter radars, radio soundings, VLF propagation studies, ionospheric scintillation of beacon satellite signals, etc. Examples of natural wave phenomena include micropulsations, mesospheric gravity waves, auroral/plasmaspheric hiss, Langmuir waves, AKR, Jovian decametric radiation, solar radio bursts, etc.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Waves.Active">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Exerting an influence or producing a change or effect. An active measurement is one which produces a transmission or excitation as a part of the measurement cycle.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Waves.Passive">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Movement or effect produced by outside influence. A passive measurement is one which does not produce a transmission or excitation as a part of the measurement cycle.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Mercury

     Identifiers for the regions surrounding the planet Mercury.
     ========================== -->
   <xsd:simpleType name="Mercury">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the regions surrounding the planet Mercury.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Magnetosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Magnetotail">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Main">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Plasmasphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Polar">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RadiationBelt">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RingCurrent">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: MixedQuantity

     Identifiers for the combined attributes of a mixed parameter quantity.
     ========================== -->
   <xsd:simpleType name="MixedQuantity">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the combined attributes of a mixed parameter quantity.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="AkasofuEpsilon">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A measure of the magnetopause energy flux and an indicator of the solar wind power available for subsequent magnetospheric energization. Defined as: V*B^2*l^2sin(theta/2)^4 where B is the IMF, l is an empirical scaling parameter equal to 7 RE, and theta = tan(BY /BZ)^-1 the IMF clock angle.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="AlfvenMachNumber">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The ratio of the bulk flow speed to the Alfven speed.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="AlfvenVelocity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Phase velocity of the Alfven wave; In SI units it is the velocity of the magnetic field divided by the square root of the mass density times the permeability of free space (mu).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="FrequencyToGyrofrequencyRatio">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The ratio of the characteristic frequency of a medium to gyrofrequency of a particle.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="IMFClockAngle">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The clockwise angle of the direction of interplanetary magnetic field (IMF) measured in the plane of the body pole perpendicular to the line between the body and the Sun. 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MagnetosonicMachNumber">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The ratio of the velocity of fast mode waves to the Alfven velocity.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Other">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Not classified with more specific terms. The context of its usage may be described in related text.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PlasmaBeta">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The ratio of the plasma pressure (nkT) to the magnetic pressure (B^2/2mu0) of the SUM(nkT)/(B^2/2mu0).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SolarUVFlux">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The amount of Ultraviolet energy originating from the Sun passing through a unit area in a unit time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="TotalPressure">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  In an MHD fluid it is the number density (N) times Boltzmann constant times the temperature in Kelvin.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="VCrossB">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The cross product of the charge velocity (V) and the magnetic field (B). It is the electric field exerted on a point charge by a magnetic field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: NearSurface

     Identifiers for regions of the gaseous and possibly ionized environment of a body extending from the surface to some specified altitude.
     ========================== -->
   <xsd:simpleType name="NearSurface">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for regions of the gaseous and possibly ionized environment of a body extending from the surface to some specified altitude.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Atmosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The neutral gases surrounding a body that extends from the surface and is bound to the body by virtue of the gravitational attraction.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="AuroralRegion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region in the atmospheric where electrically-charged particles bombarding the upper atmosphere of a planet in the presence of a magnetic field produce an optical phenomenon.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="EquatorialRegion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A region centered on the equator and limited in latitude by approximately 23 degrees north and south of the equator.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Ionosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The charged or ionized gases surrounding a body that are nominally bound to the body by virtue of the gravitational attraction.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Ionosphere.DRegion">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The layer of the ionosphere that exists approximately 50 to 95 km above the surface of the Earth. One of several layers in the ionosphere.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Ionosphere.ERegion">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A layer of ionised gas occurring at 90-150km above the ground. One of several layers in the ionosphere. Also called the The Kennelly-Heaviside layer.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Ionosphere.FRegion">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A layer that contains ionized gases at a height of around 150-800 km above sea level, placing it in the thermosphere. the F region has the highest concentration of free electrons and ions anywhere in the atmosphere. It may be thought of as comprising two layers, the F1-and F2-layers. One of several layers in the ionosphere. Also known as the Appleton layer.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Ionosphere.Topside">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region at the upper most areas of the ionosphere.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Mesosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The layer of the atmosphere that extends from the Stratosphere to a range of 80 km to 85 km, temperature decreasing with height.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MidLatitudeRegion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  When considering the case of the Earth, the mid-latitude region typically refers to two latitudinal bands, one in the northern hemisphere and the other in the southern hemisphere extending from about 23 degrees to 50 degrees. The concept of mid-latitude regions does not apply to all bodies in the solar system and different latitudinal ranges would apply for each body case by case. The mid-latitude regions may be defined by using either planetographic or magnetic coordinates if the magnetic dipole is closely aligned with the spin axis of a magnetized body. Ground magnetometers located at mid latitude on the Earth are well positioned to measure magnetic storm-time ring current variations.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Plasmasphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PolarCap">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The areas of the globe surrounding the poles and consisting of the region north of 60 degrees north latitude an the region south of 60 degrees south latitude.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SouthAtlanticAnomalyRegion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region where the Earth&#39;s inner van Allen radiation belt makes its closest approach to the planet&#39;s surface. The result is that, for a given altitude, the radiation intensity is higher over this region than elsewhere.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Stratosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The layer of the atmosphere that extends from the troposphere to about 30 km, temperature increases with height. The stratosphere contains the ozone layer.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SubAuroralRegion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  When considering the case of the Earth, the sub-auroral region typically refers to two latitudinal bands, one in the northern hemisphere and the other in the southern hemisphere extending from about 50 degrees to low 60 degrees. The concept sub-auroral regions does not apply to all bodies in the solar system and different latitudinal ranges would apply for each body case by case. The sub-auroral regions may be defined by using either planetographic or magnetic coordinates if the magnetic dipole is closely aligned with the spin axis of a magnetized body. Ground magnetometers located at sub-auroral latitudes on the Earth measure a mixture of activity driven by auroral zone currents and the ring current.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Thermosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The layer of the atmosphere that extends from the Mesosphere to 640+ km, temperature increasing with height.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Troposphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The lowest layer of the atmosphere which begins at the surface and extends to between 7 km (4.4 mi) at the poles and 17 km (10.6 mi) at the equator, with some variation due to weather factors.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Neptune

     Identifiers for the regions surrounding the planet Neptune.
     ========================== -->
   <xsd:simpleType name="Neptune">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the regions surrounding the planet Neptune.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Magnetosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Magnetotail">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Main">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Plasmasphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Polar">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RadiationBelt">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RingCurrent">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Proteus">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The second largest moon of Neptune. 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Triton">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The largest moon of Neptune.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: ParticleQuantity

     Identifiers for the characterization of the physical properties of the particle.
     ========================== -->
   <xsd:simpleType name="ParticleQuantity">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the characterization of the physical properties of the particle.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="AdiabaticInvariant">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A property of a physical system usually related to periodic phenomena that remains constant under slowly varying conditions.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="AdiabaticInvariant.MagneticMoment">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A constant of motion related to the gyromotion of a particle in a magnetic field that is either static or slowly varying with respect to the gyroperiod. The magnetic moment is usually denoted by using the lower case Greek letter for mu, 5, and can be calculated by using 5 = m u^2/2B where m is the particle mass, u is the velocity of the particle perpendicular to the  constant or average magnetic field direction, and B is the magnitude of the magnetic field strength.  
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="AdiabaticInvariant.BounceMotion">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The second adiabatic invariant is associated with periodic bounce motion of charged particles trapped between two magnetic mirrors on a magnetic field line. The second invariant, termed J, is defined by using the integral J = m &amp;int;  v|| * ds where m is the mass of the charged particle, v|| is the particle velocity along the field line, and ds represents elemental arc lengths along the field line. The second adiabatic invariant is conserved as long as changes in the background magnetic field occur at time scales much longer than the bounce time of the charged particles.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="AdiabaticInvariant.DriftMotion">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The third invariant for charged particle motion in a dipolar magnetic field is associated with drift of its guiding center in the equatorial plane. The conserved quantity, J&lt;sub&gt;2&lt;/sub&gt;, is equal to q&amp;Phi; where q is the particle charge and &amp;Phi; is the magnetic flux enclosed within the particle drift path. 
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="ArrivalDirection">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An angular measure of the direction from which an energetic particle or photon was incident on a detector. The angles may be measured in any coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="AtomicNumberDetected">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The number of protons in the nucleus of an atom as determined by a detector.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="AverageChargeState">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A measure of the composite deficit (positive) or excess (negative) of electrons with respect to protons.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ChargeFlux">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The number of ionized particles passing through a unit area per unit time, for instance as measured by a Faraday cup.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ChargeState">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Charge of a fully or partially stripped ion, in units of the charge of a proton. Charge state of a bare proton = 1.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CountRate">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The number of events per unit time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Counts">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The number of detection events occurring in a detector over the detector accumulation time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="DynamicPressure">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Dynamic pressure is a measure of the kinetic energy per unit volume of a fluid. For instance, the solar wind dynamic pressure or ram pressure for a purely proton plasma is equal to m&lt;sub&gt;p&lt;/sub&gt; n V&lt;sup&gt;2&lt;/sup&gt; where m&lt;sub&gt;p&lt;/sub&gt; is the proton mass, n the proton number density, and V the solar wind speed.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Energy">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The capacity for doing work as measured by the capability of doing work (potential energy) or the conversion of this capability to motion (kinetic energy)
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Entropy">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A function of thermodynamic quantity, such as temperature, pressure, or composition, that is a measure of the energy that is not available for work during a thermodynamic process. It is often interpreted as the degree of disorder or randomness in the system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="EnergyDensity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The amount of energy per unit volume.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="EnergyFlux">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The amount of energy passing through a unit area in a unit time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="EnergyPerCharge">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The kinetic energy, E, per unit net charge, q, that is E/q, for an electron or an ionized atom, molecule, or dust particle.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="FlowSpeed">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The rate at which particles or energy is passing through a unit area in a unit time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="FlowVelocity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The volume of matter passing through a unit area perpendicular to the direction of flow in a unit of time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Fluence">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The time integral of a flux. A fluence does not have any &quot;&quot;per unit time&quot;&quot; in its units.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GeometricFactor">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                   A measure of the gathering power of a particle detector. The geometric factor can be used to correct particle measurements by accounting for the fact that only a fraction of source particles are able to gain entry through the aperture of a detector. For an isotopic source distribution, the geometric factor corresponds to the solid angle subtended by the aperture. In practice, determination of the geometric factor requires numerical modeling and depends on detector design and the characteristics of the source.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Gyrofrequency">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The number of gyrations around a magnetic guiding center (field line) a charged particle makes per unit time due to the Lorentz force.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HeatFlux">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Flow of thermal energy through a gas or plasma; typically computed as third moment of a distribution function.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="LShell">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The L-Shell is the magnetic equatorial radius (in units of planetary radii) of a dipole magnetic field line. For instance, if the L-shell value equals 6 say at Earth, the magnetic field lines cross the magnetic equator at six Earth radii. The L-shell concept can be applied generally to any magnetized planet or satellite with a dominant dipolar magnetic field moment.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Mass">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The measure of inertia (mass) of individual objects (e.g., aerosols).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MassDensity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The mass of particles per unit volume.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MassNumber">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The total number of protons and neutrons (together known as nucleons) in an atomic nucleus.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MassPerCharge">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The mass, m, per unit net charge, q, that is m/q, for an electron or an ionized atom, molecule, or dust particle.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="NumberDensity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The number of particles per unit volume.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="NumberFlux">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The number of particles passing a unit area in unit time, possibly also per unit energy (or equivalent) and/or per unit look direction.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ParticleRadius">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The mean radius for a Gaussian distribution of particles with an axial ratio of 2 and a distribution width that varies as 0.5 radius. A value of zero means no cloud was detected.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ParticleRigidity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                   The particle momentum per unit charge. The particle Rigidity, R, is equal to pc/Ze.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PhaseSpaceDensity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The number of particles per unit volume in the six-dimensional space of position and velocity.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PlasmaFrequency">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A number-density-dependent characteristic frequency of a plasma.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Pressure">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The force per unit area exerted by a particle distribution or field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SonicMachNumber">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The ratio of the bulk flow speed to the speed of sound in the medium.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SoundSpeed">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The speed at which sound travels through a medium.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Temperature">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A measure of the kinetic energy of random motion with respect to the average. Temperature is properly defined only for an equilibrium particle distribution (Maxwellian distribution).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ThermalSpeed">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  For a Maxwellian distribution, the difference between the mean speed and the speed within which ~69% (one sigma) of all the members of the speed distribution occur.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Velocity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Rate of change of position. Also used for the average velocity of a collection of particles, also referred to as &quot;&quot;bulk velocity&quot;&quot;.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: ParticleType

     Identifiers for the characterization of the kind of particle observed by the measurement.
     ========================== -->
   <xsd:simpleType name="ParticleType">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the characterization of the kind of particle observed by the measurement.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Aerosol">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A suspension of fine solid or liquid particles in a gas.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="AlphaParticle">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A positively charged nuclear particle that consists of two protons and two neutrons.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Atom">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Matter consisting of a nucleus surrounded by electrons which has no net charge.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Dust">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Free microscopic particles of solid material.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Electron">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An elementary particle consisting of a charge of negative electricity equal to about 1.602 x 10^(-19) Coulomb and having a mass when at rest of about 9.109534 x 10^(-28) gram.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Ion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An atom that has acquired a net electric charge by gaining or losing one or more electrons.(Note: Z&gt;2)
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Molecule">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A group of atoms so united and combined by chemical affinity that they form a complete, integrated whole, being the smallest portion of any particular compound that can exist in a free state
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Neutron">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An elementary particle that has no net charge and is a constituent of atomic nuclei, and that has a mass slightly large than a proton (1.673 x 10^(-24) gram.)
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Proton">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An elementary particle that is a constituent of all atomic nuclei, that carries a positive charge numerically equal to the charge of an electron, and that has a mass of 1.673 x 10^(-24) gram.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Positron">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An elementary particle consisting of a charge of positive electricity equal to about 1.602 x 10^(-19) Coulomb and having a mass when at rest of about 9.109534 x 10^(-28) gram.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: PhenomenonType

     Identifiers for the characteristics or categorization of an observation. Note: Joe King to provide.
     ========================== -->
   <xsd:simpleType name="PhenomenonType">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the characteristics or categorization of an observation. Note: Joe King to provide.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="ActiveRegion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A localized, transient volume of the solar atmosphere in which PLAGEs, SUNSPOTS, FACULAe, FLAREs, etc. may be observed.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Aurora">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth&#39;s magnetic lines of force.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="BowShockCrossing">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A crossing of the boundary between the undisturbed (except for foreshock effects) solar wind and the shocked, decelerated solar wind of the magnetosheath.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CoronalHole">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An extended region of the corona, exceptionally low in density and associated with unipolar photospheric regions. A coronal hole can be an &quot;&quot;open&quot;&quot; magnetic field in the corona and (perhaps) inner heliosphere which has a faster than average outflow (wind); A region of lower than &quot;&quot;quiet&quot;&quot; ion and electron density in the corona; or a region of lower peak electron temperature in the corona than in the &quot;&quot;quiet&quot;&quot; corona.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CoronalMassEjection">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A solar event (CME) that involves a burst of plasma ejected into the interplanetary medium. CME&#39;s may be observed remotely relatively near the sun or in situ in the interplanetary medium. The latter type of observations are often referred to as Interplanetary CME&#39;s (ICME&#39;s).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="EITWave">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A wave in the corona of the Sun which produce shock waves on the Sun&#39;s chromosphere (Moreton Waves). EIT Waves are produced by large solar flare and expand outward at about 1,000 km/s. It usually appears as a slowly moving diffuse arc of brightening in H-alpha, and may travel for several hundred thousand km.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="EnergeticSolarParticleEvent">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An enhancement of interplanetary fluxes of energetic ions accelerated by interplanetary shocks and/or solar flares.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ForbushDecrease">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A rapid decrease in the observed galactic cosmic ray intensity following the passage of an outwardly convecting interplanetary magnetic field disturbance, such as those associated with large CME&#39;s, that sweep some galactic cosmic rays away from Earth.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GeomagneticStorm">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A magnetospheric disturbance typically defined by variations in the horizontal component of the Earth&#39;s surface magnetic field. The variation typically starts with a field enhancement associated with a solar wind pressure pulse and continues with a field depression associated with an enhancement of the diamagnetic magnetospheric ring current.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="InterplanetaryShock">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A shock propagating generally anti-sunward through the slower solar wind, often seen in front of CME-associated plasma clouds.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MagneticCloud">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A transient event observed in the solar wind characterized as a region of enhanced magnetic field strength, smooth rotation of the magnetic field vector and low proton density and temperature.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MagnetopauseCrossing">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A crossing of the interface between the shocked solar wind in the magnetosheath and the magnetic field and plasma in the magnetosphere.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="RadioBurst">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Emissions of the sun in radio wavelengths from centimeters to dekameters, under both quiet and disturbed conditions. Radio Bursts can be &quot;&quot;Type I&quot;&quot; consisting of many short, narrow-band bursts in the metric range (300 - 50 MHz).; &quot;&quot;Type II&quot;&quot; consisting of narrow-band emission that begins in the meter range (300 MHz) and sweeps slowly (tens of minutes) toward dekameter wavelengths (10 MHz).; &quot;&quot;Type III&quot;&quot; consisting of narrow-band bursts that sweep rapidly (seconds) from decimeter to dekameter wavelengths (500 - 0.5 MHz); and &quot;&quot;Type IV&quot;&quot; consisting of a smooth continuum of broad-band bursts primarily in the meter range (300 - 30 MHz).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SectorBoundaryCrossing">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A sector boundary crossing is a transit by a spacecraft across the heliospheric current sheet separating the dominantly outward (away-from-the-sun) interplanetary magnetic field of one hemisphere of the heliosphere from the dominantly inward (toward-the-sun) polarity of the other hemisphere.  Such crossings have multi-day intervals of opposite IMF dominant polarities on either side.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SolarFlare">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An explosive event in the Sun&#39;s atmosphere which produces electromagnetic radiation across the electromagnetic spectrum at multiple wavelengths from long-wave radio to the shortest wavelength gamma rays.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SolarWindExtreme">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Intervals of unusually large or small values of solar wind attributes such as flow speed and ion density.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="StreamInteractionRegion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region (SIR) where two solar wind streams, typically having differing characteristics and solar sources, abut up against (and possibly partially interpenetrate) each other.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Substorm">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A process by which plasma in the magnetotail becomes energized at a fast rate.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: ProcessingLevel

     Identifiers to characterize the amount and type of manipulation which has been applied to the sampled data.
     ========================== -->
   <xsd:simpleType name="ProcessingLevel">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers to characterize the amount and type of manipulation which has been applied to the sampled data.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Calibrated">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Data wherein sensor outputs have been convolved with instrument response function, often irreversibly, to yield data in physical units.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Raw">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Data in its original state with no processing to account for calibration!!!
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MachineLearning">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The study of computer algorithms that improve automatically through experience and by the use of data.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="MachineLearning.Training">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Information which is used to train a model. For example, a dataset which is used to determine the weights in a model.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="MachineLearning.Validation">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Information which is used to determine the fit of a model, often used to reduce overfitting.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="MachineLearning.Test">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Information that is only used to test the final output of the model in order to confirm the accuracy of model results. This type of information (i.e. data) is used to detect if the model was unintentionally made to peek on the validation data and resulted in overfitting.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Uncalibrated">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Duplicate data are removed from the data stream and data are time ordered. Values are not adjusted for any potential biases or external factors.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Projection

     Identifiers to projections into a coordinate system.
     ========================== -->
   <xsd:simpleType name="Projection">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers to projections into a coordinate system.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="IJ">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A measure of the length of a position or measured vector projected into the i-j (typically X-Y) plane of the coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="IK">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A measure of the length of a position or measured vector projected into the i-k (typically X-Z) plane of the coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="JK">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A measure of the length of a position or measured vector projected into the j-k (typically Y-Z) plane of the coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Venus

     Identifiers for the regions surrounding the planet Venus.
     ========================== -->
   <xsd:simpleType name="Venus">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the regions surrounding the planet Venus.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Magnetosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Magnetotail">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Main">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Plasmasphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Polar">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RadiationBelt">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RingCurrent">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Qualifier

     Identifiers for terms which refine the type or attribute of a quantity.
     ========================== -->
   <xsd:simpleType name="Qualifier">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for terms which refine the type or attribute of a quantity.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Anisotropy">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Direction-dependent property.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Array">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A sequence of values corresponding to the elements in a rectilinear, n-dimension matrix. Each value can be referenced by a unique index.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="AutoSpectrum">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The Fourier transform of the auto correlation function for physical or empirical observations, which describes the general dependence of the time series data values at one instant on the time series data values at another instant.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Average">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The statistical mean; the sum of a set of values divided by the number of values in the set.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Characteristic">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A quantity which can be easily identified and measured in a given environment.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Circular">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Relative to polarization, right-hand circularly polarized light is defined such that the electric field is rotating clockwise as seen by an observer towards whom the wave is moving. Left-hand circularly polarized light is defined such that the electric field is rotating counterclockwise as seen by an observer towards whom the wave is moving. The polarization of magnetohydrodynamic waves is specified with respect to the ambient mean magnetic field : right-hand polarized waves have a transverse electric field component which turns in a right-handed sense (that of the gyrating electrons) around the magnetic field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Coherence">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The coherence, Cxy, between two signals x(t) and y(t) is a real-valued function. The square of the coherence is defined by using: Cxy^2 = |Gxy(f)|^2 / Gxx(f)Gyy(f) where Gxy(f) is equal to the cross-spectral density between two time series denoted as x and y, respectively, and Gxx(f) and Gyy(f) are equal to the auto-spectral densities of the same two time series. Values of Cxy 2 always lie in the range between zero and one, 0 = Cxy 2 = 1, in accordance with the Cauchy-Schwarz inequality.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Column">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A two-dimensional measure of a quantity. The column is the area over which the quantity is measured.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Component">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Projection of a vector along one of the base axes of a coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Component.I">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Projection of a vector along the first named axis of a coordinate system. Typically the X axis, but could be the R axis for an RTN coordinate system.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Component.J">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Projection of a vector along the second named axis of a coordinate system. Typically the Y axis, but could be the T axis for an RTN coordinate system.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Component.K">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Projection of a vector along the third named axis of a coordinate system. Typically the Z axis, but could be the N axis for an RTN coordinate system.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Confidence">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An expression of how certain that a quantity is valid or accurate.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Core">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The central or main part of an object or calculated distribution. For example, the part of a distribution of particles at low energies that is a thermal (Maxwellian) population. 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CrossSpectrum">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The Fourier transform of the cross correlation of two physical or empirical observations.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Deviation">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The difference between an observed value and the expected value of a quantity.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Differential">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A measurement within a narrow range of energy and/or solid angle.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Direction">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The spatial relation between an object and another object, the orientation of the object or the course along which the object points or moves.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Directional">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A measurement within a narrow range of solid angle.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="DirectionAngle">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The angle between a position vector or measured vector (or one of its projections onto a plane) and one of the base axes of the coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="DirectionAngle.AzimuthAngle">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The angle between the projection into the i-j plane of a position or measured vector and the i-axis of the coordinate system. Mathematically defined as arctan(j/i). This term could be also applied to angles measured in different planes, for example the IMF clock angle defined as arctan(|By|/Bz). 
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="DirectionAngle.ElevationAngle">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The angle between the position or measured vector and the i-j plane of the coordinate system. Mathematically defined as arctan(k/SQRT(i^2+j^2)).
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="DirectionAngle.PolarAngle">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The angle between the position or measured vector and the k-axis of the coordinate system. Mathematically defined as arctan([SQRT(i^2+j^2)]/k). This term could be also applied to angles between the vector and other components, for example the IMF cone angle defined as arccos(Bx/Bt).
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="DirectionCosine">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The cosine of the angle between two vectors usually between a vector and one of the basis axes defining a Cartesian coordinate system. Three angles and thus three direction cosines are required to define a vector direction in a three dimensional Euclidean space.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="DirectionCosine.I">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Projection of a vector along the first named axis of a coordinate system. Typically the X axis, but could be the R axis for an RTN coordinate system.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="DirectionCosine.J">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Projection of a vector along the second named axis of a coordinate system. Typically the Y axis, but could be the T axis for an RTN coordinate system.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="DirectionCosine.K">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Projection of a vector along the third named axis of a coordinate system. Typically the Z axis, but could be the N axis for an RTN coordinate system.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="EncodedParameter">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A variable that uses successive bits to encode, this is bitwise encode, a set of conditions by using a composited multibit numeric value. A common example is a bitwise encoded flag that denotes whether various possible errors that may affect a particular measurement. For example, a bit value equal to zero may indicate the absence of a particular error condition while a value equal to one would indicate the possibility that the associated datum should be ignored or used with caution due to the same error categorization.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="FieldAligned">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The component of a quantity which is oriented in the same direction of a field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Fit">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Values that make an model agree with the data.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Group">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An assemblage of values that a certain relation or common characteristic.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Halo">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The part of an object or distribution surrounding some central body or distribution.  For example, the particles above the core energies that show enhancements above the thermal population.  Typically, a &quot;&quot;power law tail&quot;&quot; shows a break from the core Maxwellian at a particular energy.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ImaginaryPart">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Any number z can in general be represented by its complex form with z = a + ib where i, which is defined as the square root of -1, signifies the imaginary component of the number z. The coefficient b is called the imaginary part of the complex number z.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Integral">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A flux measurement in a broad range of energy and solid angle.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Integral.Area">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Integration over the extent of a planar region, or of the surface of a solid.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Integral.Bandwidth">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Integration over the width a frequency band.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Integral.SolidAngle">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     Integration over the angle in three-dimensional space that an object subtends at a point.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Linear">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Polarization where the E-field vector is confined to a given plane
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="LineOfSight">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The line of sight is the line that connects the observer with the observed object. This expression is often used with measurements of Doppler velocity and magnetic field in magnetograms, where only the component of the vector field directed along the line of sight is measured.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Magnitude">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A measure of the strength of a vector quantity or length of its representational vector.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Maximum">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The largest value of a batch or sample or the upper bound of a probability distribution.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Median">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The measure of central tendency of a set of n. values computed by ordering the values and taking the value at position (n.  + 1) / 2 when n. is odd or the arithmetic mean of the values at positions n.  / 2 and (n. / 2) + 1 when n.  is even.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Minimum">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The smallest value of a batch or sample or the lower bound of a probability distribution.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Moment">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Parameters determined by integration over a distribution function convolved with a power of velocity.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Parallel">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Having the same direction as a given direction
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Peak">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The maximum value for the quantity in question, over a period of time which is usually equal to the cadence.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Perpendicular">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  At right angles to a given direction.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Perturbation">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Variations in the state of a system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Phase">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A point or portion in a recurring series of changes.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PhaseAngle">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Phase difference between two or more waves, normally expressed in degrees.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PowerSpectralDensity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The Power Spectral Density, PSD, is the measure of signal power content versus frequency, energy, wave number, etc. A PSD is typically used to characterize broadband random signals. The amplitude of the PSD is normalized by the spectral resolution employed to digitize the signal.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Projection">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A measure of the length of a position or measured vector as projected into a plane of the coordinate system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Projection.IJ">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A measure of the length of a position or measured vector projected into the i-j (typically X-Y) plane of the coordinate system.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Projection.IK">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A measure of the length of a position or measured vector projected into the i-k (typically X-Z) plane of the coordinate system.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Projection.JK">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A measure of the length of a position or measured vector projected into the j-k (typically Y-Z) plane of the coordinate system.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Pseudo">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Similar to or having the appearance of something else. Can be used to indicate an estimation or approximation of a particular quantity.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Ratio">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The relative magnitudes of two quantities.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="RealPart">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Any number z can in general be represented by its complex form with z = a + ib where i, which is defined as the square root of -1, signifies the imaginary component of the number z. The coefficient a is called the real part of the complex number z.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Scalar">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A quantity that is completely specified by its magnitude and has no direction.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Spectral">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Characterized as a range or continuum of frequencies.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="StandardDeviation">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The square root of the average of the squares of deviations about the mean of a set of data. Standard deviation is a statistical measure of spread or variability.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="StokesParameters">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A set of four parameters (usually called I,Q, U and V) which describe the polarization state of an electromagnetic wave propagating through space.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Strahl">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A distribution of particles concentrated in a narrow energy band. The band may be may be aligned with a secondary feature. For example, it may occur in a narrow cone aligned with the mean magnetic field direction. 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Superhalo">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The part of an object or distribution surrounding some central body or distribution evident in a second break in the distribution function (e.g., a different power law).  It consists of a population at a higher energies than for a halo.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Symmetric">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Equal distribution about one or more axes.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Tensor">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A generalized linear &quot;&quot;quantity&quot;&quot; or &quot;&quot;geometrical entity&quot;&quot; that can be expressed as a multi-dimensional array relative to a choice of basis of the particular space on which it is defined.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Total">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The summation of quantities over all possible species.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Trace">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The sum of the elements on the main diagonal (the diagonal from the upper left to the lower right) of a square matrix.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Uncertainty">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A statistically defined discrepancy between a measured quantity and the true value of that quantity that cannot be corrected by calculation or calibration.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Variance">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A measure of dispersion of a set of data points around their mean value. The expectation value of the squared deviations from the mean.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Vector">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A set of parameter values each along some independent variable (e.g., components of a field in three orthogonal spatial directions; atmospheric temperature values at several altitudes, or at a given latitude and longitude;).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Region

     Identifiers for areas of the physical world which may be occupied or observed.
     ========================== -->
   <xsd:simpleType name="Region">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for areas of the physical world which may be occupied or observed.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Asteroid">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A small extraterrestrial body consisting mostly of rock and metal that is in orbit around the sun.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Comet">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Earth">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The third planet from the sun in our solar system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Earth.Magnetosheath">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region between the bow shock and the magnetopause, characterized by very turbulent plasma.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Earth.Magnetosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
                  <xsd:enumeration value="Earth.Magnetosphere.Magnetotail">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.Magnetosphere.Main">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.Magnetosphere.Plasmasphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.Magnetosphere.Polar">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.Magnetosphere.RadiationBelt">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.Magnetosphere.RingCurrent">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
               <xsd:enumeration value="Earth.Moon">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The only natural satellite of the Earth.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Earth.NearSurface">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The gaseous and possibly ionized environment of a body extending from the surface to some specified altitude. For the Earth, this altitude is 2000 km.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.Atmosphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The neutral gases surrounding a body that extends from the surface and is bound to the body by virtue of the gravitational attraction.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.AuroralRegion">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region in the atmospheric where electrically-charged particles bombarding the upper atmosphere of a planet in the presence of a magnetic field produce an optical phenomenon.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.EquatorialRegion">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        A region centered on the equator and limited in latitude by approximately 23 degrees north and south of the equator.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.Ionosphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The charged or ionized gases surrounding a body that are nominally bound to the body by virtue of the gravitational attraction.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                     <xsd:enumeration value="Earth.NearSurface.Ionosphere.DRegion">
                        <xsd:annotation>
                           <xsd:documentation xml:lang="en">
                           The layer of the ionosphere that exists approximately 50 to 95 km above the surface of the Earth. One of several layers in the ionosphere.
                           </xsd:documentation>
                        </xsd:annotation>
                     </xsd:enumeration>
                     <xsd:enumeration value="Earth.NearSurface.Ionosphere.ERegion">
                        <xsd:annotation>
                           <xsd:documentation xml:lang="en">
                           A layer of ionised gas occurring at 90-150km above the ground. One of several layers in the ionosphere. Also called the The Kennelly-Heaviside layer.
                           </xsd:documentation>
                        </xsd:annotation>
                     </xsd:enumeration>
                     <xsd:enumeration value="Earth.NearSurface.Ionosphere.FRegion">
                        <xsd:annotation>
                           <xsd:documentation xml:lang="en">
                           A layer that contains ionized gases at a height of around 150-800 km above sea level, placing it in the thermosphere. the F region has the highest concentration of free electrons and ions anywhere in the atmosphere. It may be thought of as comprising two layers, the F1-and F2-layers. One of several layers in the ionosphere. Also known as the Appleton layer.
                           </xsd:documentation>
                        </xsd:annotation>
                     </xsd:enumeration>
                     <xsd:enumeration value="Earth.NearSurface.Ionosphere.Topside">
                        <xsd:annotation>
                           <xsd:documentation xml:lang="en">
                           The region at the upper most areas of the ionosphere.
                           </xsd:documentation>
                        </xsd:annotation>
                     </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.Mesosphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The layer of the atmosphere that extends from the Stratosphere to a range of 80 km to 85 km, temperature decreasing with height.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.MidLatitudeRegion">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        When considering the case of the Earth, the mid-latitude region typically refers to two latitudinal bands, one in the northern hemisphere and the other in the southern hemisphere extending from about 23 degrees to 50 degrees. The concept of mid-latitude regions does not apply to all bodies in the solar system and different latitudinal ranges would apply for each body case by case. The mid-latitude regions may be defined by using either planetographic or magnetic coordinates if the magnetic dipole is closely aligned with the spin axis of a magnetized body. Ground magnetometers located at mid latitude on the Earth are well positioned to measure magnetic storm-time ring current variations.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.Plasmasphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.PolarCap">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The areas of the globe surrounding the poles and consisting of the region north of 60 degrees north latitude an the region south of 60 degrees south latitude.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.SouthAtlanticAnomalyRegion">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region where the Earth&#39;s inner van Allen radiation belt makes its closest approach to the planet&#39;s surface. The result is that, for a given altitude, the radiation intensity is higher over this region than elsewhere.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.Stratosphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The layer of the atmosphere that extends from the troposphere to about 30 km, temperature increases with height. The stratosphere contains the ozone layer.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.SubAuroralRegion">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        When considering the case of the Earth, the sub-auroral region typically refers to two latitudinal bands, one in the northern hemisphere and the other in the southern hemisphere extending from about 50 degrees to low 60 degrees. The concept sub-auroral regions does not apply to all bodies in the solar system and different latitudinal ranges would apply for each body case by case. The sub-auroral regions may be defined by using either planetographic or magnetic coordinates if the magnetic dipole is closely aligned with the spin axis of a magnetized body. Ground magnetometers located at sub-auroral latitudes on the Earth measure a mixture of activity driven by auroral zone currents and the ring current.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.Thermosphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The layer of the atmosphere that extends from the Mesosphere to 640+ km, temperature increasing with height.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Earth.NearSurface.Troposphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The lowest layer of the atmosphere which begins at the surface and extends to between 7 km (4.4 mi) at the poles and 17 km (10.6 mi) at the equator, with some variation due to weather factors.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
               <xsd:enumeration value="Earth.Surface">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The outermost area of a solid object.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Heliosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The solar atmosphere extending roughly from the outer corona to the edge of the solar plasma at the heliopause separating primarily solar plasma from interstellar plasma.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Heliosphere.Heliosheath">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region extending radially outward from the heliospheric termination shock and in which the decelerated solar wind plasma is still significant.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Heliosphere.Inner">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of the heliosphere extending radially outward from the solar coronal base to just inside 1 AU.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Heliosphere.NearEarth">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The heliospheric region near the Earth which extends to and includes the area near the L1 and L2 Lagrange point.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Heliosphere.Outer">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of the heliosphere extending radially outward from just outside 1 AU to the heliospheric termination shock.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Heliosphere.Remote1AU">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A roughly toroidal region that includes the Earth&#39;s orbit, but exclusive of the region near the Earth.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Interstellar">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region between stars outside of the star&#39;s heliopause.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Jupiter">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The fifth planet from the sun in our solar system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Jupiter.Callisto">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A second largest moon of Jupiter and the third-largest moon in the solar system.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Jupiter.Europa">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The sixth-closest round moon of Jupiter.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Jupiter.Ganymede">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The biggest moon of Jupiter and in the solar system.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Jupiter.Io">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The innermost of the four round moons of the planet Jupiter.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Jupiter.Magnetosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
                  <xsd:enumeration value="Jupiter.Magnetosphere.Magnetotail">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Jupiter.Magnetosphere.Main">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Jupiter.Magnetosphere.Plasmasphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Jupiter.Magnetosphere.Polar">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Jupiter.Magnetosphere.RadiationBelt">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Jupiter.Magnetosphere.RingCurrent">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
            <xsd:enumeration value="Mars">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The forth planet from the sun in our solar system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Mars.Deimos">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The smaller and outermost of the two natural satellites of Mars.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Mars.Magnetosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
                  <xsd:enumeration value="Mars.Magnetosphere.Magnetotail">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Mars.Magnetosphere.Main">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Mars.Magnetosphere.Plasmasphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Mars.Magnetosphere.Polar">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Mars.Magnetosphere.RadiationBelt">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Mars.Magnetosphere.RingCurrent">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
               <xsd:enumeration value="Mars.Phobos">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The larger and inner most moon of Mars.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Mercury">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The first planet from the sun in our solar system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Mercury.Magnetosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
                  <xsd:enumeration value="Mercury.Magnetosphere.Magnetotail">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Mercury.Magnetosphere.Main">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Mercury.Magnetosphere.Plasmasphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Mercury.Magnetosphere.Polar">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Mercury.Magnetosphere.RadiationBelt">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Mercury.Magnetosphere.RingCurrent">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
            <xsd:enumeration value="Neptune">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The seventh planet from the sun in our solar system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Neptune.Magnetosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
                  <xsd:enumeration value="Neptune.Magnetosphere.Magnetotail">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Neptune.Magnetosphere.Main">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Neptune.Magnetosphere.Plasmasphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Neptune.Magnetosphere.Polar">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Neptune.Magnetosphere.RadiationBelt">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Neptune.Magnetosphere.RingCurrent">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
               <xsd:enumeration value="Neptune.Proteus">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The second largest moon of Neptune. 
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Neptune.Triton">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The largest moon of Neptune.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Pluto">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The ninth (sub)planet from the sun in our solar system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Saturn">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The sixth planet from the sun in our solar system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Saturn.Dione">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The forth-largest moon of Saturn.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Saturn.Enceladus">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The sixth-largest moon of Saturn. It is currently endogenously active. The smallest known body in the Solar System that is geologically active today.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Saturn.Iapetus">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The third-largest moon of Saturn and the eleventh-largest in the Solar System.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Saturn.Magnetosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
                  <xsd:enumeration value="Saturn.Magnetosphere.Magnetotail">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Saturn.Magnetosphere.Main">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Saturn.Magnetosphere.Plasmasphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Saturn.Magnetosphere.Polar">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Saturn.Magnetosphere.RadiationBelt">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Saturn.Magnetosphere.RingCurrent">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
               <xsd:enumeration value="Saturn.Mimas">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The smallest and least massive of the round moons of Saturn.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Saturn.Rhea">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The second-largest moon of Saturn and the ninth-largest moon in the Solar System.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Saturn.Tethys">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The third largest moon of Saturn.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Saturn.Titan">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The largest moon of Saturn and the second-largest moon in the Solar System,
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Sun">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The star upon which our solar system is centered.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Sun.Chromosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of the Sun&#39;s (or a star&#39;s) atmosphere above the temperature minimum and below the Transition Region. The solar chromosphere is approximately 400 km to 2100 km above the photosphere, and characterized by temperatures from 4500 - 28000 K.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Sun.Corona">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The outermost atmospheric region of the Sun or a star, characterized by ionization temperatures above 10^5 K. The solar corona starts at about 2100 km above the photosphere; there is no generally defined upper limit.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Sun.Interior">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region inside the body which is not visible from outside the body.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Sun.Photosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The atmospheric layer of the Sun or a star from which continuum radiation, especially optical, is emitted to space. For the Sun, the photosphere is about 500 km thick.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Sun.TransitionRegion">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A very narrow (&lt;100 km) layer between the chromosphere and the corona where the temperature rises abruptly from about 8000 to about 500,000 K.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Uranus">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The eighth planet from the sun in our solar system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Uranus.Ariel">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The fourth-largest moon of Uranus.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Uranus.Magnetosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
                  <xsd:enumeration value="Uranus.Magnetosphere.Magnetotail">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Uranus.Magnetosphere.Main">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Uranus.Magnetosphere.Plasmasphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Uranus.Magnetosphere.Polar">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Uranus.Magnetosphere.RadiationBelt">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Uranus.Magnetosphere.RingCurrent">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
               <xsd:enumeration value="Uranus.Miranda">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The smallest and innermost round moon of Uranus.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Uranus.Oberon">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The second-largest and second most massive mon of Uranus, and the ninth most massive moon in the Solar System.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Uranus.Puck">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The largest inner spherical moon of Uranus.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Uranus.Titania">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The largest moon of Uranus and the eighth largest moon in the Solar System.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Uranus.Umbriel">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The third largest and fourth most massive moon of Uranus.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Venus">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The second planet from the sun in our solar system.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Venus.Magnetosphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
                  <xsd:enumeration value="Venus.Magnetosphere.Magnetotail">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Venus.Magnetosphere.Main">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Venus.Magnetosphere.Plasmasphere">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Venus.Magnetosphere.Polar">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Venus.Magnetosphere.RadiationBelt">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
                  <xsd:enumeration value="Venus.Magnetosphere.RingCurrent">
                     <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                        </xsd:documentation>
                     </xsd:annotation>
                  </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: RenderingAxis

     Identifiers for the reference component of a plot or rendering of data.
     ========================== -->
   <xsd:simpleType name="RenderingAxis">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the reference component of a plot or rendering of data.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="ColorBar">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A spectrum or set of colors used to represent data values.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Horizontal">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Parallel to or in the plane of the horizon or a base line.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Vertical">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Perpendicular to the plane of the horizon or a base line.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Role

     Identifiers for the assigned or assumed function or position of an individual.
     ========================== -->
   <xsd:simpleType name="Role">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the assigned or assumed function or position of an individual.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="ArchiveSpecialist">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who is an expert on a collection of resources and may also be knowledgeable of the phenomenon and related physics represented by the resources. This includes librarians, curators, archive scientists and other experts.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CoInvestigator">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who is a scientific peer and major participant in an investigation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="CoPI">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who is peer of a principal investigator and is an administrative and scientific lead for an investigation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Contributor">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An entity responsible for making contributions to the content of the resource.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="DataProducer">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who generated the resource and is familiar with its provenance.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="DeputyPI">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who is an administrative or scientific leader for an investigation operating under the supervision of a Principal Investigator.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Developer">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The developer of a system to imitate a situation or process.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="FormerPI">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who had served as the administrative and scientific lead for an investigation, but no longer assumes that role.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GeneralContact">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who can provide information on a range of subjects or who can direct you to a domain expert.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HostContact">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who can provide specific information with regard the hosting of a resource or supporting software.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="InstrumentLead">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who is the designated leader of an instrument or intrument package.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MetadataContact">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who can affect a change in the metadata describing a resource.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MissionManager">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A Mission Manager is a rolename used by the ESA. The Mission Manager corresponds to the Project Manager role used by NASA but the Mission Manager role only begins after the launch of the mission.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MissionPrincipalInvestigator">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who is the administrative and scientific lead for a mission.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PrincipalInvestigator">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who is the administrative and scientific lead for an investigation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ProgramManager">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual whose major task entails direction of program team members such that the full organization achieves the objectives and goals of a program. The Program Manager is expected to provide clear guidance and resolve conflicts and issues while maintaining focus on achieving program success.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ProgramScientist">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A program scientist is someone who performs a range of scientific program planning duties, takes responsibility for the science content of flight mission programs or projects. A program scientist develops, reviews, and provides recommendations for proposed program requirements, expected results, budgetary estimates and also establishes methods and procedures to reduce program costs, provides expert advice to management on strategic planning and program development, develops and manages research program, and presents issues and proposes solutions to senior management. 
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ProjectEngineer">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An engineer tasked with the full suite of responsibilities as a project transitions through requirements derivation and preliminary design into controlled hardware development, assembly and environmental testing. The Project Engineer manages a team while developing the cadence of hardware manufacturing and assembly until instrument deployment and through the end of the mission.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ProjectManager">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                   An individual whose major task entails direction of project team members such that the full organization achieves the objectives and goals of the mission. The Project Manager is expected to provide clear guidance and resolve conflicts and issues while maintaining focus on achieving mission success.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ProjectScientist">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who is an expert in the phenomenon and related physics explored by the project. A project scientist may also have a managerial role within the project.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Publisher">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual, organization, institution or government department responsible for the production and dissemination of a document.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Scientist">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who is an expert in the phenomenon and related physics represented by the resource.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="TeamLeader">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who is the designated leader of an investigation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="TeamMember">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who is a major participant in an investigation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="TechnicalContact">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who can provide specific information with regard to the resource or supporting software.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="User">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An individual who utilizes a resource or service.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Saturn

     Identifiers for the regions surrounding the planet Saturn.
     ========================== -->
   <xsd:simpleType name="Saturn">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the regions surrounding the planet Saturn.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Dione">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The forth-largest moon of Saturn.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Enceladus">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The sixth-largest moon of Saturn. It is currently endogenously active. The smallest known body in the Solar System that is geologically active today.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Iapetus">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The third-largest moon of Saturn and the eleventh-largest in the Solar System.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Magnetosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region of space above the atmosphere or surface of the planet, and bounded by the magnetopause, that is under the direct influence of the planet&#39;s magnetic field.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Magnetotail">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region on the night side of the body where the magnetic filed is stretched backwards by the force of the solar wind. For Earth, the magnetotail begins at a night-side radial distance of 10 Re (X &gt; -10Re).
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Main">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region of the magnetosphere where the magnetic field lines are closed, but does not include the gaseous region gravitationally bound to the body.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Plasmasphere">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     A region of the magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.Polar">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region near the pole of a body. For a magnetosphere the polar region is the area where magnetic field lines are open and includes the auroral zone.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RadiationBelt">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     The region within a magnetosphere where high-energy particles could potentially be trapped in a magnetic field.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
               <xsd:enumeration value="Magnetosphere.RingCurrent">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                     One of the major current systems confined within planetary magnetospheres. The ring current circles in the magnetic equatorial plane of magnetospheres. It is generated by the longitudinal drift of energetic charged particles trapped on inner, dipole-like magnetospheric field lines. At the Earth, the ring current is carried by 10 to 200 keV charged particles typically located at L-shells between 3 and 6. The ring current is also the primary driver of the Sym H and Dst Indices of magnetic storm activity at the Earth.
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:enumeration>
            <xsd:enumeration value="Mimas">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The smallest and least massive of the round moons of Saturn.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Rhea">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The second-largest moon of Saturn and the ninth-largest moon in the Solar System.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Tethys">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The third largest moon of Saturn.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Titan">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The largest moon of Saturn and the second-largest moon in the Solar System,
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: ScaleType

     Identifiers for scaling applied to a set of numbers.
     ========================== -->
   <xsd:simpleType name="ScaleType">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for scaling applied to a set of numbers.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="LinearScale">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Intervals which are equally spaced.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="LogScale">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Intervals which are spaced proportionally to the logarithms of the values being represented.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: SourceType

     Identifiers for the characterization of the function or purpose of a source.
     ========================== -->
   <xsd:simpleType name="SourceType">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the characterization of the function or purpose of a source.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Ancillary">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A complementary item which can be subordinate, subsidiary, auxiliary, supplementary to the primary item.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Browse">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A representation of an image which is suitable to reveal most or all of the details of the image.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Data">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A collection of organized information, usually the results of experience, observation or experiment, or a set of premises. This may consist of numbers, words, or images, particularly as measurements or observations of a set of variables.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Layout">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The structured arrangement of items in a collection.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Thumbnail">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A small representation of an image which is suitable to infer what the full-sized imaged is like.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: SpectralRange

     Identifiers for names associated with wavelengths. Based on the ISO 21348 Solar Irradiance Standard. Additions have been made to extend the frequency ranges to include those used in space physics. Those additions are indicated in blue text. The "Total Solar Irradiance" category has not been included since it is a type of measurement and not a specific spectral range. See Appendix A - Comparison of Spectrum Domains for a comparison of the spectral ranges with other systems.
     ========================== -->
   <xsd:simpleType name="SpectralRange">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for names associated with wavelengths. Based on the ISO 21348 Solar Irradiance Standard. Additions have been made to extend the frequency ranges to include those used in space physics. Those additions are indicated in blue text. The &quot;Total Solar Irradiance&quot; category has not been included since it is a type of measurement and not a specific spectral range. See Appendix A - Comparison of Spectrum Domains for a comparison of the spectral ranges with other systems.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="CaK">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A spectrum with a wavelength of range centered near 393.5 nm. VSO nickname: Ca-K image with range of 391.9 nm to 395.2 nm.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ExtremeUltraviolet">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A spectrum with a wavelength range of 10.0 nm to 125.0nm. VSO nickname: EUV image with a range of of 10.0 nm to 125.0 nm
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="FarUltraviolet">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A spectrum with a wavelength range of 122 nm to 200.0nm. VSO nickname: FUV image with a range of 122.0 nm to 200 nm
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="GammaRays">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Photons with a wavelength range: 0.00001 to 0.001 nm
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Halpha">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A spectrum with a wavelength range centered at 656.3 nm. VSO nickname: H-alpha image with a spectrum range of of 655.8 nm to 656.8 nm.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HardXrays">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Photons with a wavelength range: 0.001 to 0.1 nm and an energy range of 12 keV to 120 keV
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="He10830">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A spectrum with a wavelength range centered at 1082.9 nm. VSO nickname: He 10830 image with a range of 1082.5 nm to 1083.3 nm.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="He304">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A spectrum centered around the resonance line of ionised helium at 304 Angstrom (30.4 nm).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Infrared">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Photons with a wavelength range: 760 to 1.00x10^6 nm
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="K7699">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A spectrum with a wavelength range centred at 769.9 nm. VSO nickname: K-7699 dopplergram with a range of 769.8 nm to 770.0 nm.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="LBHBand">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Lyman-Birge-Hopfield band in the far ultraviolet range with wavelength range of 140nm to 170 nm.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Microwave">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Photons with a wavelength range: 1.00x10^6 to 1.50x10^7 nm
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="NaD">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A spectrum with a wavelength range of centered at 589.3 nm. VSO nickname: Na-D image with a range of 588.8 nm to 589.8 nm.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Ni6768">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A spectrum with a wavelength range centered at 676.8 nm. VSO nickname: Ni-6768 dopplergram with a range of of 676.7 nm to 676.9 nm.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Optical">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Photons with a wavelength range: 380 to 760 nm
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="RadioFrequency">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Photons with a wavelength range: 100,000 to 1.00x10^11 nm
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SoftXRays">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  X-Rays with an energy range of 0.12 keV to 12 keV.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Ultraviolet">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Photons with a wavelength range: 10 to 400 nm.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="WhiteLight">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Photons with a wavelength in the visible range for humans.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="XRays">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Photons with a wavelength range: 0.001 &lt;= x &lt; 10 nm
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Style

     Identifiers for the manner in which a response from a URL is presented.
     ========================== -->
   <xsd:simpleType name="Style">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the manner in which a response from a URL is presented.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="File">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Access to a file containing the data.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="HAPI">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A Heliophysics Application Programmer Interface (HAPI) specification compliant access point.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Listing">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A listing of files - either through FTP or HTTP.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Search">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A web search interface that requires additional input.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Template">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A URI template that contains special fields as defined in URI Template specification &lt;http://tsds.org/uri_templates&gt;.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Overview">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A web page that provides and overview of available data and links.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="WebService">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A Web-based service that uses SOAP, WSDL or UDDI open standards.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Sun

     Identifiers for regions of the star upon which our solar system is centered.
     ========================== -->
   <xsd:simpleType name="Sun">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for regions of the star upon which our solar system is centered.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Chromosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region of the Sun&#39;s (or a star&#39;s) atmosphere above the temperature minimum and below the Transition Region. The solar chromosphere is approximately 400 km to 2100 km above the photosphere, and characterized by temperatures from 4500 - 28000 K.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Corona">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The outermost atmospheric region of the Sun or a star, characterized by ionization temperatures above 10^5 K. The solar corona starts at about 2100 km above the photosphere; there is no generally defined upper limit.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Interior">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The region inside the body which is not visible from outside the body.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Photosphere">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The atmospheric layer of the Sun or a star from which continuum radiation, especially optical, is emitted to space. For the Sun, the photosphere is about 500 km thick.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="TransitionRegion">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A very narrow (&lt;100 km) layer between the chromosphere and the corona where the temperature rises abruptly from about 8000 to about 500,000 K.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: SupportQuantity

     Identifiers for the information useful in understanding the context of an observation, typically observed or measured coincidentally with a physical observation.
     ========================== -->
   <xsd:simpleType name="SupportQuantity">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the information useful in understanding the context of an observation, typically observed or measured coincidentally with a physical observation.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="DataQuality">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An ancillary parameter that denotes the standard or degree of accuracy, trustworthiness, or usefulness of another parameter.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Housekeeping">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Parameters that indicate the status or health state of instruments or monitoring devices as measured in physical units such as that for current, voltage, or temperature. Housekeeping data can be analyzed to determine whether instruments are working correctly and the knowledge of their values may be used to avoid errors or even device failures.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="InstrumentMode">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An indication of a state (mode) in which the instrument is operating. How a mode influences the interpretation and representation of data is described in instrument related documentation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Orientation">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                    The specification of the directional alignment of an object or measurement in a reference coordinate system. The orientation such as a spacecraft spin axis attitude is usually expressed as one or more angles relative to the basis axes of some specified physical space usually together with the date/time of the observation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Other">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Not classified with more specific terms. The context of its usage may be described in related text.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Positional">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The specification of the location of an object or measurement within a reference coordinate system. The position is usually expressed as a set of values corresponding to the location along a set of orthogonal axes together with the date/time of the observation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="RotationMatrix">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A tensor that is used to perform vector data transformation from one coordinate system to another.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SpinPeriod">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                   The time required for an object such as a spacecraft or planet to perform one full rotation in a given frame of reference.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SpinPhase">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  An angular based or normalized parameter that specifies the spin state of an object such as a spacecraft or planet in a specific coordinate system usually together with the date/time of the observation.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SpinRate">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                    The angular rate of change of the spin angle of an object such as a spacecraft or planet.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Telemetry">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Parameters that include full packets of data from monitoring devices or the memory addresses of datum within telemetry packets. The data comprising telemetry packets are typically expressed by using non-physical engineering units and may be used to express a variety of device operating conditions such as command acceptance/execution, housekeeping, event characterization, memory dumps, and science data. Telemetry packets may be raw or unpacked.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Temporal">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Pertaining to time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Velocity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Rate of change of position. Also used for the average velocity of a collection of particles, also referred to as &quot;&quot;bulk velocity&quot;&quot;.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Text

     Identifiers for the encoding of sequences of characters.
     ========================== -->
   <xsd:simpleType name="Text">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the encoding of sequences of characters.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="ASCII">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A sequence of characters that adheres to American Standard Code for Information Interchange (ASCII) which is an 7-bit character-coding scheme.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Unicode">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Text in multi-byte Unicode format.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: WaveQuantity

     Identifiers for the characterization of the physical properties of a wave.
     ========================== -->
   <xsd:simpleType name="WaveQuantity">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the characterization of the physical properties of a wave.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Absorption">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Decrease of radiant energy (relative to the background continuum spectrum).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ACElectricField">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Alternating electric field component of a wave.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ACMagneticField">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Alternating magnetic field component of a wave.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Albedo">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The ratio of reflected radiation from the surface to incident radiation upon it.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="DopplerFrequency">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Change in the frequency of a propagating wave due to motion of the source, the observer, the reflector, or the propagation medium.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Emissivity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The energy emitted spontaneously per unit bandwidth (typically frequency) per unit time per unit mass of source. Emissivity is usually integrated over all directions/solid angles.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="EnergyFlux">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The amount of energy passing through a unit area in a unit time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="EquivalentWidth">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The spectral width of a total absorption line having the amount of absorbed radiant energy being equivalent to that in an observed absorption line.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Frequency">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The number of occurrences of a repeating event per unit time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Gyrofrequency">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The number of gyrations around a magnetic guiding center (field line) a charged particle makes per unit time due to the Lorentz force.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Intensity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The measurement of radiant or wave energy per unit detector area per unit bandwidth per unit solid angle per unit time.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="LineDepth">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The measure of the amount of absorption below the continuum (depth) in a particular wavelength or frequency in an absorption spectrum.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="LowerHybridFrequency">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Lower hybrid oscillations involve longitudinal motions of electrons and ions in a magnetized plasma. The propagation of lower hybrid waves must be close to perpendicular to the background magnetic field in so that electrons cannot move along field lines thus preventing wave growth. The lower hybrid frequency, &amp;Phi;&lt;sub&gt;LH&lt;/sub&gt;, can be calculated by using &amp;Phi;&lt;sub&gt;LH&lt;/sub&gt; = [(&amp;Omega;&lt;sub&gt;ce&lt;/sub&gt;&amp;Omega;&lt;sub&gt;ci&lt;/sub&gt;)&lt;sup&gt;-1&lt;/sup&gt; + &amp;Phi;&lt;sub&gt;pi&lt;/sub&gt;&lt;sup&gt;-2&lt;/sup&gt;]&lt;sup&gt;-1/2&lt;/sup&gt; where &amp;Omega;&lt;sub&gt;ce&lt;/sub&gt; and &amp;Omega;&lt;sub&gt;ci&lt;/sub&gt; are the electron and ion cyclotron frequencies, respectively, and Phi;&lt;sub&gt;LH&lt;/sub&gt; is the ion plasma frequency.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MagneticField">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A region of space near a magnetized body where magnetic forces can be detected (as measured by methods such as Zeeman splitting, etc.).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="ModeAmplitude">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  In helioseismology the magnitude of oscillation of waves of a particular geometry.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PlasmaFrequency">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A number-density-dependent characteristic frequency of a plasma.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Polarization">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Direction of the electric vector of an electromagnetic wave. The wave can be linearly polarized in any direction perpendicular to the direction of travel, circularly polarized (clockwise or counterclockwise), unpolarized, or mixtures of the above.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PoyntingFlux">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Electromagnetic energy flux transported by a wave characterized as the rate of energy transport per unit area per steradian.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PropagationTime">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Time difference between transmission and reception of a wave in an active wave experiment.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="StokesParameters">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  A set of four parameters (usually called I,Q, U and V) which describe the polarization state of an electromagnetic wave propagating through space.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="UpperHybridFrequency">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Upper hybrid oscillations involve longitudinal motions of electrons perpendicular to the magnetic field. The upper hybrid frequency, &amp;Phi;&lt;sub&gt;UH&lt;/sub&gt;, is governed by the relationship&amp;Phi;&lt;sub&gt;UH&lt;/sub&gt;^2 = &amp;Phi;&lt;sub&gt;pe&lt;/sub&gt;^2 + &amp;Theta;&lt;sub&gt;ce&lt;/sub&gt;^2 where &amp;Phi;&lt;sub&gt;pe&lt;/sub&gt; is electron plasma frequency and &amp;Theta;&lt;sub&gt;ce&lt;/sub&gt; is the electron cyclotron frequency.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Velocity">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Rate of change of position. Also used for the average velocity of a collection of particles, also referred to as &quot;&quot;bulk velocity&quot;&quot;.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="VolumeEmissionRate">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The volume emission rate, e(r, t, l), is the number of photons emitted per unit source volume per second, i.e. photons/(m3 s), as measured along the line of sight between the source point and the observer. The Volume Emission Rate is in general a function of the line-ofsight distance, r, time, t, and wavelength, l. The Volume Emission Rate is actually not a directly measurable quantity. However, the term has been commonly used in both data product descriptions and research publications.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Wavelength">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  The peak-to-peak distance over one wave period.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: WaveType

     Identifiers for the carrier or phenomenum of wave information observed by the measurement.
     ========================== -->
   <xsd:simpleType name="WaveType">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for the carrier or phenomenum of wave information observed by the measurement.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Electromagnetic">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Electric and magnetic field variations in time and space that propagate through a medium or a vacuum with the wave&#39;s propagation, electric field, and magnetic field vectors forming an orthogonal triad. Waves in this category are detected by having their field quantities measured.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Electrostatic">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Collective longitudinal electric-field and plasma oscillations trapped within a body of plasma.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Hydrodynamic">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Periodic or quasi-periodic oscillations of fluid quantities.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="MHD">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Hydrodynamic waves in a magnetized plasma in which the background magnetic field plays a key role in controlling the wave propagation characteristics.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Photon">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Electromagnetic waves detected by techniques that utilize their corpuscular character (e.g., CCD, CMOS, photomultipliers).
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="PlasmaWaves">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Self-consistent collective oscillations of particles and fields (electric and magnetic) in a plasma.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ==========================
     List: Waves

     Identifiers for experimental and natural wave phenomena.
     ========================== -->
   <xsd:simpleType name="Waves">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
         Identifiers for experimental and natural wave phenomena.
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
            <xsd:enumeration value="Active">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Exerting an influence or producing a change or effect. An active measurement is one which produces a transmission or excitation as a part of the measurement cycle.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Passive">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                  Movement or effect produced by outside influence. A passive measurement is one which does not produce a transmission or excitation as a part of the measurement cycle.
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:enumeration>
      </xsd:restriction>
   </xsd:simpleType>
<!-- ================================
      Types
     ================================ -->

   <xsd:simpleType name="typeSequence">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
            <xsd:annotation>
               <xsd:documentation xml:lang="en">
               A list of whole number values where the order of the values is fixed. A space separates each value. For example, &quot;1 2 3&quot;.
               </xsd:documentation>
            </xsd:annotation>
         </xsd:documentation>
      </xsd:annotation>
      <xsd:list itemType="xsd:integer"/>
   </xsd:simpleType>

   <xsd:simpleType name="typeID">
      <xsd:annotation>
         <xsd:documentation xml:lang="en">
            <xsd:annotation>
               <xsd:documentation xml:lang="en">
               SPASE Identifier
               </xsd:documentation>
            </xsd:annotation>
         </xsd:documentation>
      </xsd:annotation>
      <xsd:restriction base="xsd:string">
         <xsd:pattern value="[^:]+://[^/]+/.+"/>
      </xsd:restriction>
   </xsd:simpleType>
</xsd:schema>