<xsd:schema targetNamespace="http://www.ivoa.net/xml/VOSICapabilities/v1.0"
            xmlns:tns="http://www.ivoa.net/xml/VOSICapabilities/v1.0"
            xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0"
            xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            elementFormDefault="qualified"
            attributeFormDefault="unqualified"
            version="1.0">

  <xsd:annotation>
     <xsd:documentation>
       A schema for formatting service capabilities as returned by a 
       capabilities resource, defined by the IVOA Support Interfaces 
       specification (VOSI). 
       See http://www.ivoa.net/Documents/latest/VOSI.html.  
     </xsd:documentation>
  </xsd:annotation>

  <xsd:import namespace="http://www.ivoa.net/xml/VOResource/v1.0"
              schemaLocation="http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource-v1.0.xsd" />

  <!--
    -  the root element for a VOSI capabilities metadata (section 2.1)
    -->
  <xsd:element name="capabilities">
     <xsd:annotation>
       <xsd:documentation>
         A listing of capabilities supported by a service
       </xsd:documentation>
     </xsd:annotation>

     <xsd:complexType>
        <xsd:sequence>

           <xsd:element name="capability" type="vr:Capability" 
                        form="unqualified" minOccurs="0" maxOccurs="unbounded">
              <xsd:annotation>
                <xsd:documentation>
                  A capability supported by the service.  
                </xsd:documentation>
                <xsd:documentation>
                  A protocol-specific capability is included by specifying a
                  vr:Capability sub-type via an xsi:type attribute on this 
                  element.
                </xsd:documentation>
              </xsd:annotation>
         </xsd:element>

      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>

</xsd:schema>