CDPP / AMDA_IHM

spase-2_3_1.xsd 413 KB
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<?xml version="1.0" encoding="UTF-8"?>
<!-- Automatically created based on the dictionary stored at http://www.spase-group.org -->
<!-- Version: 2.3.1 -->
<!-- Generated: 2019-11-21 17:47:18.360 -->
<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="2.3.1">

      <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="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 "data product" 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="1"/>
            <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 "physical
               parameter" 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 "mixed."
            </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="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" namespace="##other"/>
         </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 "data product" 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 "data product" 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="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="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="1"/>
            <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>
<!-- ================================
      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 ";". When an author is
               a persons use "last,first[,middle]" 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="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="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="Elevation">
         <xsd:annotation>
            <xsd:documentation xml:lang="en">
               The distance in meters above (positive) or
               below (negative) the "zero elevation" 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 "local-part@domain".
            </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 "1". A value of
               "0" is a wild card for all elements at the
               location in an array. A value of "-1" is a
               reference to the dimension at the location
               in the array. A "-1" is used when describing
               the attributes of the dimension, where as
               "0" 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="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 "Investigation" 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="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="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="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="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 "Column_X" for a single-element
               parameter and "Column_X-Column_Y" 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="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">
               The key (identifier) of the resource within
               a Repository. This is a local identifier which
               can be used to retrieve or locate the resource.
            </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 "scheme://authority/path"
               where "scheme" is "spase" for those resources
               administered through the SPASE framework,
               "authority" is the unique identifier for the
               resource provider registered within the SPASE
               framework and "path" is the unique identifier
               of the resource within the context of the
               "authority". 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="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'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="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="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="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="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 "Re" 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
               "number &gt; x", where "number" is a numerical
               value and "x" 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: "1.0E-9&gt;T" which
               converts the units, presumable nT, to Tesla.
               Another example is: "1.0e+3&gt;m/s" 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="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="2.3.1"/>
      </xsd:restriction>
</xsd:simpleType>
<!-- ==========================
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>
<!-- ==========================
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="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: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, ?, and can be calculated by
                  using ? = 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:restriction>
</xsd:simpleType>
<!-- ==========================
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>
<!-- ==========================
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>
<!-- ==========================
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>
<!-- ==========================
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>
<!-- ==========================
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>
<!-- ==========================
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>
<!-- ==========================
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>
<!-- ==========================
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="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="Carrington">
            <xsd:annotation>
               <xsd:documentation xml:lang="en">
                  A coordinate system which is centered at the
                  Sun and is "fixed" 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="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's dipole axis, positive northward.
                  X is in the plane defined by Z and the line
                  linking the observation point with the Earth'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'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'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'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'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'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'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'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'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's rotation axis. If N is a unit
                  vector from the Earth'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'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="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'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="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="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'Heure.
               </xsd:documentation>
            </xsd:annotation>
         </xsd:enumeration>
      </xsd:restriction>
</xsd:simpleType>
<!-- ==========================
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>
<!-- ==========================
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>
<!-- ==========================
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>
<!-- ==========================
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="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="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>
<!-- ==========================
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'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's inner van Allen
                  radiation belt makes its closest approach
                  to the planet'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>
<!-- ==========================
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="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="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 "+" and "/" symbols, with the "="
                  symbol as a special suffix (padding) code.
               </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>
<!-- ==========================
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'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 "spacecraft potential".
                  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>
<!-- ==========================
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="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="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 "negative" analog image is registered. A
                  "positive" 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="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 "Report
                  on Establishment &amp; Operation of the Incoherent-
                  Scatter Data Base", 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'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="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="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="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="UDF">
            <xsd:annotation>
               <xsd:documentation xml:lang="en">
                  Universal Data Format (UDF). The Optical Technology
                  Storage Association'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>
<!-- ==========================
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 "negative" analog image is registered. A
                  "positive" 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>
<!-- ==========================
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>
<!-- ==========================
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's orbit, but exclusive of the region
                  near the Earth.
               </xsd:documentation>
            </xsd:annotation>
         </xsd:enumeration>
      </xsd:restriction>
</xsd:simpleType>
<!-- ==========================
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'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="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">
                  
               </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 collection of components which can be positioned
                  and oriented as a single unit. A platform
                  may contain other platforms. For example,
                  a spacecraft is a platform which may have
                  components that can be articulated and are
                  also considered platforms.
               </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 "semiconductor detector".
               </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>
<!-- ==========================
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>
<!-- ==========================
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>
<!-- ==========================
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'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>
<!-- ==========================
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. "Irradiance" 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. ("Magnetogram.")
               </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="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>
<!-- ==========================
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>
<!-- ==========================
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's inner van Allen
                  radiation belt makes its closest approach
                  to the planet'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>
<!-- ==========================
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.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="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, ?, and can be calculated by
                  using ? = 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="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="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="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="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="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="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 "per unit time" 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="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="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="PhaseSpaceDensity">
            <xsd:annotation>
               <xsd:documentation xml:lang="en">
                  
               </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 "bulk velocity".
               </xsd:documentation>
            </xsd:annotation>
         </xsd:enumeration>
      </xsd:restriction>
</xsd:simpleType>
<!-- ==========================
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="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: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:restriction>
</xsd:simpleType>
<!-- ==========================
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'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 "open" magnetic field in the corona and
                  (perhaps) inner heliosphere which has a faster
                  than average outflow (wind); A region of lower
                  than "quiet" ion and electron density in the
                  corona; or a region of lower peak electron
                  temperature in the corona than in the "quiet"
                  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'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's
                  (ICME'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'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'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'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 "Type I" consisting of many short,
                  narrow-band bursts in the metric range (300
                  - 50 MHz).; "Type II" consisting of narrow-band
                  emission that begins in the meter range (300
                  MHz) and sweeps slowly (tens of minutes) toward
                  dekameter wavelengths (10 MHz).; "Type III"
                  consisting of narrow-band bursts that sweep
                  rapidly (seconds) from decimeter to dekameter
                  wavelengths (500 - 0.5 MHz); and "Type IV"
                  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'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>
<!-- ==========================
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="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>
<!-- ==========================
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>
<!-- ==========================
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="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="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="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="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="FieldAligned">
            <xsd:annotation>
               <xsd:documentation xml:lang="en">
                  
               </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 "power law tail" shows a break
                  from the core Maxwellian at a particular energy.
               </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="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="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="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="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="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">
                  
               </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 "quantity" or "geometrical
                  entity" 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>
<!-- ==========================
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'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's inner van Allen
                  radiation belt makes its closest approach
                  to the planet'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'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'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'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">
                  
               </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'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'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="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'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's (or a star'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'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'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>
<!-- ==========================
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>
<!-- ==========================
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="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="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="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>
<!-- ==========================
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>
<!-- ==========================
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>
<!-- ==========================
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 "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: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>
<!-- ==========================
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="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="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="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>
<!-- ==========================
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's (or a star'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>
<!-- ==========================
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="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="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="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 "bulk velocity".
               </xsd:documentation>
            </xsd:annotation>
         </xsd:enumeration>
      </xsd:restriction>
</xsd:simpleType>
<!-- ==========================
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>
<!-- ==========================
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="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="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="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">
                  
               </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 "bulk velocity".
               </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>
<!-- ==========================
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'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>
<!-- ==========================
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, "1 2 3".
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:documentation>
         </xsd:annotation>
         <xsd:list itemType="xsd:integer"/>
      </xsd:simpleType>

      <xsd:simpleType name="typeStringSequence">
         <xsd:annotation>
            <xsd:documentation xml:lang="en">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                     
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:documentation>
         </xsd:annotation>
         <xsd:list itemType="xsd:string"/>
      </xsd:simpleType>

      <xsd:simpleType name="typeFloatSequence">
         <xsd:annotation>
            <xsd:documentation xml:lang="en">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                     
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:documentation>
         </xsd:annotation>
         <xsd:list itemType="xsd:float"/>
      </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:complexType name="typeValue">
         <xsd:annotation>
            <xsd:documentation xml:lang="en">
               <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                     
                  </xsd:documentation>
               </xsd:annotation>
            </xsd:documentation>
         </xsd:annotation>
         <xsd:simpleContent>
            <xsd:extension base="xsd:double">
               <xsd:attribute name="Units" type="xsd:string">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                        <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 "Re" 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:documentation>
                  </xsd:annotation>
               </xsd:attribute>
               <xsd:attribute name="UnitsConversion" type="xsd:string">
                  <xsd:annotation>
                     <xsd:documentation xml:lang="en">
                        <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
                              "number &gt; x", where "number" is a numerical
                              value and "x" 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: "1.0E-9&gt;T" which
                              converts the units, presumable nT, to Tesla.
                              Another example is: "1.0e+3&gt;m/s" which converts
                              a velocity expressed in kilometers per second
                              to meters per second.
                           </xsd:documentation>
                        </xsd:annotation>
                     </xsd:documentation>
                  </xsd:annotation>
               </xsd:attribute>
            </xsd:extension>
         </xsd:simpleContent>
      </xsd:complexType>

      <xsd:complexType name="typeElementBoundary">
         <xsd:annotation>
            <xsd:documentation xml:lang="en">
               
            </xsd:documentation>
         </xsd:annotation>
         <xsd:sequence>
         </xsd:sequence>
      </xsd:complexType>
</xsd:schema>