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<?xml version="1.0" encoding="UTF-8"?>
<!--W3C Schema for VOTable  = Virtual Observatory Tabular Format
     See History at      http://vizier.u-strasbg.fr/doc/VOTable
     See Discussions at  http://archives.us-vo.org/VOTable
  This XML schema can be referenced by
       http://us-vo.org/xml/VOTable.xsd
   or  http://cdsweb.u-strasbg.fr/xml/VOTable.xsd 
  The DTD is available from
       http://us-vo.org/xml/VOTable.dtd
   or  http://cdsweb.u-strasbg.fr/xml/VOTable.dtd 
.Version 1.0 : 15-Apr-2002
.Version 1.0a: 27-Sep-2001 in MIN MAX STREAM
.Version 1.0b: 09-Nov-2002 from Steve Lowe, slowe@head-cfa.harvard.edu:
	       in DEFINITIONS, use 'xs:sequence' rather than 'xs:all'
.Version 1.0c: 12-Nov-2002 from Steve Lowe, use xs:choice in DEFINITIONS
.Version 1.0d: 10-Dec-2002 Allow several INFO TABLE
-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" targetNamespace="http://www.ivoa.net/xml/VOTable/v1.0" xmlns:vot="http://www.ivoa.net/xml/VOTable/v1.0">

<!-- Here we define some interesting new datatypes:
     - anyTEXT   may have embedded XHTML (conforming HTML)
     - astroYear is an epoch in Besselian or Julian year, e.g. J2000
     - arrayDEF  specifies an array size e.g. 12x23x*
     - dataType  defines the acceptable datatypes
     - precType  defines the acceptable precisions
     - yesno     defines just the 2 alternatives
-->

<xs:complexType name="anyTEXT" mixed="true">
      <xs:sequence>
        <xs:any minOccurs="0" maxOccurs="unbounded" processContents="skip"/>
      </xs:sequence>
</xs:complexType>

<xs:simpleType name="astroYear">
  <xs:restriction base="xs:token">
    <xs:pattern value="[JB][0-9]+([.][0-9]*)?"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="arrayDEF">
  <xs:restriction base="xs:token">
    <xs:pattern value="([0-9]+x)*[0-9]*[*]?"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="dataType">
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="boolean"/>
    <xs:enumeration value="bit"/>
    <xs:enumeration value="unsignedByte"/>
    <xs:enumeration value="short"/>
    <xs:enumeration value="int"/>
    <xs:enumeration value="long"/>
    <xs:enumeration value="char"/>
    <xs:enumeration value="unicodeChar"/>
    <xs:enumeration value="float"/>
    <xs:enumeration value="double"/>
    <xs:enumeration value="floatComplex"/>
    <xs:enumeration value="doubleComplex"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="precType">
  <xs:restriction base="xs:token">
    <xs:pattern value="[EF]?[1-9][0-9]*"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="yesno">
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="yes"/>
    <xs:enumeration value="no"/>
  </xs:restriction>
</xs:simpleType>

<!-- VOTable is the root element -->
  <xs:element name="VOTABLE">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="vot:DESCRIPTION" minOccurs="0"/>
        <xs:element ref="vot:DEFINITIONS" minOccurs="0"/>
        <xs:element ref="vot:INFO" minOccurs="0" maxOccurs="unbounded"/>
        <xs:element ref="vot:RESOURCE" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute name="ID" type="xs:ID"/>
      <xs:attribute name="version">
        <xs:simpleType>
          <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="1.0"/>
          </xs:restriction>
        </xs:simpleType>
      </xs:attribute>
    </xs:complexType>
  </xs:element>

<!-- RESOURCES can contain DESCRIPTION, (INFO|PARM|LINK), (TABLE|RESOURCE) -->
  <xs:element name="RESOURCE">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="vot:DESCRIPTION" minOccurs="0"/>
        <xs:element ref="vot:INFO" minOccurs="0" maxOccurs="unbounded"/>
        <xs:element ref="vot:COOSYS" minOccurs="0" maxOccurs="unbounded"/>
        <xs:element ref="vot:PARAM" minOccurs="0" maxOccurs="unbounded"/>
        <xs:element ref="vot:LINK" minOccurs="0" maxOccurs="unbounded"/>
        <xs:element ref="vot:TABLE" minOccurs="0" maxOccurs="unbounded"/>
        <xs:element ref="vot:RESOURCE" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute name="name" type="xs:token"/>
      <xs:attribute name="ID" type="xs:ID"/>
      <xs:attribute name="type" default="results">
        <xs:simpleType>
          <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="results"/>
            <xs:enumeration value="meta"/>
          </xs:restriction>
        </xs:simpleType>
      </xs:attribute>
    </xs:complexType>
  </xs:element>

  <xs:element name="DESCRIPTION" type="vot:anyTEXT"/>

  <xs:element name="DEFINITIONS">
    <xs:complexType>
      <xs:choice minOccurs="0" maxOccurs="unbounded">
        <xs:element ref="vot:COOSYS"/>
        <xs:element ref="vot:PARAM"/>
      </xs:choice>
    </xs:complexType>
  </xs:element>

<!-- INFO is a name-value pair -->
  <xs:element name="INFO">
    <xs:complexType mixed="true"><xs:complexContent>
      <xs:extension base="vot:anyTEXT">
        <xs:attribute name="ID" type="xs:ID"/>
        <xs:attribute name="name" type="xs:token" use="required"/>
        <xs:attribute name="value" type="xs:string" use="required"/>
      </xs:extension>
    </xs:complexContent></xs:complexType>
  </xs:element>

<!-- A PARAM is similar to a FIELD, but it also has a "value" attribute -->
  <xs:element name="PARAM">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="vot:DESCRIPTION" minOccurs="0"/>
        <xs:element ref="vot:VALUES" minOccurs="0"/>
        <xs:element ref="vot:LINK" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute name="ID" type="xs:ID"/>
      <xs:attribute name="unit" type="xs:token"/>
      <xs:attribute name="datatype" type="vot:dataType"/>
      <xs:attribute name="precision" type="vot:precType"/>
      <xs:attribute name="width" type="xs:positiveInteger"/>
      <xs:attribute name="ref" type="xs:IDREF"/>
      <xs:attribute name="name" type="xs:token" use="required"/>
      <xs:attribute name="ucd" type="xs:token"/>
      <xs:attribute name="value" type="xs:string"/>
      <xs:attribute name="arraysize" type="vot:arrayDEF"/>
    </xs:complexType>
  </xs:element>

<!-- A TABLE is a sequence of FIELDS and LINKS and DESCRIPTION, 
     possibly followed by a DATA section 
-->
  <xs:element name="TABLE">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="vot:DESCRIPTION" minOccurs="0"/>
        <xs:element ref="vot:FIELD" minOccurs="0" maxOccurs="unbounded"/>
        <xs:element ref="vot:LINK" minOccurs="0" maxOccurs="unbounded"/>
        <xs:element ref="vot:DATA" minOccurs="0"/>
      </xs:sequence>
      <xs:attribute name="ID" type="xs:ID"/>
      <xs:attribute name="name" type="xs:token"/>
      <xs:attribute name="ref" type="xs:IDREF"/>
    </xs:complexType>
  </xs:element>

<!-- FIELD is the definition of what is in a column of the table -->
  <xs:element name="FIELD">
    <xs:complexType>
      <xs:sequence minOccurs="0" maxOccurs="unbounded">
        <xs:element ref="vot:DESCRIPTION" minOccurs="0"/>
        <xs:element ref="vot:VALUES" minOccurs="0" maxOccurs="2"/>
        <xs:element ref="vot:LINK" minOccurs="0"/>
      </xs:sequence>
      <xs:attribute name="ID" type="xs:ID"/>
      <xs:attribute name="unit" type="xs:token"/>
      <xs:attribute name="datatype" type="vot:dataType" use="required"/>
      <xs:attribute name="precision" type="vot:precType"/>
      <xs:attribute name="width" type="xs:positiveInteger"/>
      <xs:attribute name="ref" type="xs:IDREF"/>
      <xs:attribute name="name" type="xs:token" use="required"/>
      <xs:attribute name="ucd" type="xs:string"/>
      <xs:attribute name="arraysize" type="xs:string"/>
      <xs:attribute name="type">
        <xs:simpleType>
          <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="hidden"/>
            <xs:enumeration value="no_query"/>
            <xs:enumeration value="trigger"/>
          </xs:restriction>
        </xs:simpleType>
      </xs:attribute>
    </xs:complexType>
  </xs:element>

<!-- VALUES expresses the values that can be taken by the data 
     in a column or by a parameter
-->
  <xs:element name="VALUES">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="vot:MIN" minOccurs="0"/>
        <xs:element ref="vot:MAX" minOccurs="0"/>
        <xs:element ref="vot:OPTION" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute name="ID" type="xs:ID"/>
      <xs:attribute name="type" default="legal">
        <xs:simpleType>
          <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="legal"/>
            <xs:enumeration value="actual"/>
          </xs:restriction>
        </xs:simpleType>
      </xs:attribute>
      <xs:attribute name="null" type="xs:token"/>
      <xs:attribute name="invalid" type="vot:yesno" default="no"/>
    </xs:complexType>
  </xs:element>
  <xs:element name="MIN">
    <xs:complexType>
      <xs:simpleContent><xs:extension base="xs:string">
        <xs:attribute name="value" type="xs:string" use="required"/>
        <xs:attribute name="inclusive" type="vot:yesno" default="yes"/>
      </xs:extension></xs:simpleContent>
    </xs:complexType>
  </xs:element>
  <xs:element name="MAX">
    <xs:complexType>
      <xs:simpleContent><xs:extension base="xs:string">
        <xs:attribute name="value" type="xs:string" use="required"/>
        <xs:attribute name="inclusive" type="vot:yesno" default="yes"/>
      </xs:extension></xs:simpleContent>
    </xs:complexType>
  </xs:element>
  <xs:element name="OPTION">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="vot:OPTION" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute name="name" type="xs:token"/>
      <xs:attribute name="value" type="xs:string" use="required"/>
    </xs:complexType>
  </xs:element>

<!-- The LINK is a URL (href) or some other kind of reference (gref) -->
  <xs:element name="LINK">
    <xs:complexType><xs:simpleContent><xs:extension base="xs:string">
    <xs:attribute name="ID" type="xs:ID"/>
      <xs:attribute name="content-role">
        <xs:simpleType>
          <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="query"/>
            <xs:enumeration value="hints"/>
            <xs:enumeration value="doc"/>
          </xs:restriction>
        </xs:simpleType>
      </xs:attribute>
      <xs:attribute name="content-type" type="xs:token"/>
      <xs:attribute name="title" type="xs:string"/>
      <xs:attribute name="value" type="xs:string"/>
      <xs:attribute name="href" type="xs:anyURI"/>
      <xs:attribute name="gref" type="xs:token"/>
      <xs:attribute name="action" type="xs:anyURI"/>
  </xs:extension></xs:simpleContent></xs:complexType>
  </xs:element>

<!-- DATA is the actual table data, in one of three formats -->
  <xs:element name="DATA">
    <xs:complexType>
      <xs:sequence>
         <xs:element ref="vot:TABLEFORMAT"/>
      </xs:sequence>
<!--
      <xs:choice>
        <xs:element ref="vot:TABLEDATA"/>
        <xs:element ref="vot:BINARY"/>
        <xs:element ref="vot:FITS"/>
      </xs:choice>
  -->
    </xs:complexType>
  </xs:element>

  <xs:element name="TABLEFORMAT" type="vot:TABLEFORMATType" abstract="true">
    <xs:annotation>
      <xs:documentation>
        an abstract representation of the tables storage form.  
      </xs:documentation>
    </xs:annotation>
  </xs:element>

  <xs:complexType name="TABLEFORMATType">
    <xs:sequence/>
  </xs:complexType>

  <xs:complexType name="StreamTABLEFORMATType">
    <xs:complexContent>
      <xs:extension base="vot:TABLEFORMATType">
        <xs:sequence>
          <xs:element ref="vot:STREAM"/>
        </xs:sequence>
      </xs:extension>    
    </xs:complexContent>
  </xs:complexType>

<!-- Pure XML data -->
  <xs:element name="TABLEDATA" substitutionGroup="vot:TABLEFORMAT">
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="vot:TABLEFORMATType">
      	  <xs:sequence>
      	    <xs:element ref="vot:TR" minOccurs="0" maxOccurs="unbounded"/>
      	  </xs:sequence>
        </xs:extension>    
      </xs:complexContent>
    </xs:complexType>
  </xs:element>

  <xs:element name="TD">
    <xs:complexType mixed="true"><xs:complexContent>
      <xs:extension base="vot:anyTEXT">
        <xs:attribute name="ref" type="xs:IDREF"/>
      </xs:extension>
    </xs:complexContent></xs:complexType>
  </xs:element>

  <xs:element name="TR">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="vot:TD" maxOccurs="unbounded"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

<!-- FITS file, perhaps with specification of which extension to seek to -->
  <xs:element name="FITS" substitutionGroup="vot:TABLEFORMAT">
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="vot:StreamTABLEFORMATType">
          <xs:attribute name="extnum" type="xs:positiveInteger"/>
        </xs:extension>    
      </xs:complexContent>
    </xs:complexType>
  </xs:element>

<!-- BINARY data format -->
  <xs:element name="BINARY" type="vot:StreamTABLEFORMATType" substitutionGroup="vot:TABLEFORMAT"/>

<!-- STREAM can be local or remote, encoded or not -->
  <xs:element name="STREAM">
    <xs:complexType>
      <xs:simpleContent>
        <xs:extension base="xs:string">
          <xs:attribute name="type" default="locator">
            <xs:simpleType>
              <xs:restriction base="xs:NMTOKEN">
                <xs:enumeration value="locator"/>
                <xs:enumeration value="other"/>
              </xs:restriction>
            </xs:simpleType>
          </xs:attribute>
          <xs:attribute name="href" type="xs:anyURI"/>
          <xs:attribute name="actuate" default="onRequest">
            <xs:simpleType>
              <xs:restriction base="xs:NMTOKEN">
                <xs:enumeration value="onLoad"/>
                <xs:enumeration value="onRequest"/>
                <xs:enumeration value="other"/>
                <xs:enumeration value="none"/>
              </xs:restriction>
            </xs:simpleType>
          </xs:attribute>
          <xs:attribute name="encoding" default="none">
            <xs:simpleType>
              <xs:restriction base="xs:NMTOKEN">
                <xs:enumeration value="gzip"/>
                <xs:enumeration value="base64"/>
                <xs:enumeration value="dynamic"/>
                <xs:enumeration value="none"/>
              </xs:restriction>
            </xs:simpleType>
          </xs:attribute>
          <xs:attribute name="expires" type="xs:dateTime"/>
          <xs:attribute name="rights" type="xs:token"/>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>
  </xs:element>

<!-- Expresses the coordinate system we are using -->
  <xs:element name="COOSYS">
    <xs:complexType mixed="true"><xs:complexContent>
      <xs:extension base="vot:anyTEXT">
        <xs:attribute name="ID" type="xs:ID"/>
        <xs:attribute name="equinox" type="vot:astroYear"/>
        <xs:attribute name="epoch" type="vot:astroYear"/>
        <xs:attribute name="system" default="eq_FK5">
          <xs:simpleType>
            <xs:restriction base="xs:NMTOKEN">
              <xs:enumeration value="eq_FK4"/>
              <xs:enumeration value="eq_FK5"/>
              <xs:enumeration value="ICRS"/>
              <xs:enumeration value="ecl_FK4"/>
              <xs:enumeration value="ecl_FK5"/>
              <xs:enumeration value="galactic"/>
              <xs:enumeration value="supergalactic"/>
              <xs:enumeration value="xy"/>
              <xs:enumeration value="barycentric"/>
              <xs:enumeration value="geo_app"/>
            </xs:restriction>
          </xs:simpleType>
        </xs:attribute>
      </xs:extension></xs:complexContent></xs:complexType>
  </xs:element>

</xs:schema>