<xs:schema
    targetNamespace='http://www.w3.org/2011/03/ws-mex'
    xmlns:tns='http://www.w3.org/2011/03/ws-mex'
    xmlns:wsa='http://www.w3.org/2005/08/addressing'
    xmlns:xs='http://www.w3.org/2001/XMLSchema'
    elementFormDefault='qualified'
    blockDefault='#all'>

  <xs:import
      namespace='http://www.w3.org/2005/08/addressing'
      schemaLocation='http://www.w3.org/2006/03/addressing/ws-addr.xsd'/>

  <!-- Types and global elements -->
  <xs:simpleType name='QNameSerialization'>
    <xs:restriction base='xs:string'>
      <xs:pattern value='\{.*\}.+'/>
      <!-- A QName w/o a namespace-uri is realized as "{}local-name} -->
    </xs:restriction>
  </xs:simpleType>

  <!-- GetWSDL request -->
  <xs:element name='GetWSDL'>
    <xs:complexType>
      <xs:sequence>
        <xs:any namespace='##other' processContents='lax' minOccurs='0'
                maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax'/>
    </xs:complexType>
  </xs:element>

  <!-- GetWSDL response -->
  <xs:element name='GetWSDLResponse'>
    <xs:complexType>
      <xs:sequence>
        <xs:any namespace='##other' processContents='lax' minOccurs='0'
                maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax'/>
    </xs:complexType>
  </xs:element>

  <!-- Get Metadata request -->
  <xs:element name='GetMetadata'>
    <xs:complexType>
      <xs:sequence>
        <xs:element ref='tns:Dialect' minOccurs='0' maxOccurs='unbounded'/>
        <xs:any namespace='##other' processContents='lax' minOccurs='0'
                maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:attribute name='Content' type='xs:anyURI'/>
      <xs:anyAttribute namespace='##other' processContents='lax'/>
    </xs:complexType>
  </xs:element>

  <!-- Get Metadata response -->
  <xs:element name='GetMetadataResponse'>
    <xs:complexType>
      <xs:sequence>
        <xs:element ref='tns:Metadata'/>
        <xs:any namespace='##other' processContents='lax' minOccurs='0'
                maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax'/>
    </xs:complexType>
  </xs:element>

  <!-- Put Metadata request -->
  <xs:element name='PutMetadata'>
    <xs:complexType>
      <xs:sequence>
        <xs:element ref='tns:Metadata'/>
        <xs:any namespace='##other' processContents='lax' minOccurs='0'
                maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax'/>
    </xs:complexType>
  </xs:element>

  <!-- Put Metadata response -->
  <xs:element name='PutMetadataResponse'>
    <xs:complexType>
      <xs:sequence>
        <xs:element ref='tns:Metadata' minOccurs='0'/>
        <xs:any namespace='##other' processContents='lax' minOccurs='0'
                maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax'/>
    </xs:complexType>
  </xs:element>

  <!-- Delete Metadata request -->
  <xs:element name='DeleteMetadata'>
    <xs:complexType>
      <xs:sequence>
        <xs:element ref='tns:Dialect' minOccurs='0' maxOccurs='unbounded'/>
        <xs:any namespace='##other' processContents='lax' minOccurs='0'
                maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax'/>
    </xs:complexType>
  </xs:element>

  <!-- Delete Metadata response -->
  <xs:element name='DeleteMetadataResponse'>
    <xs:complexType>
      <xs:sequence>
        <xs:any namespace='##other' processContents='lax' minOccurs='0'
                maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax'/>
    </xs:complexType>
  </xs:element>

  <xs:element name='Dialect'>
    <xs:complexType>
      <xs:attribute name='Type' type='tns:QNameSerialization' use='required'/>
      <xs:attribute name='Identifier' type='xs:anyURI'/>
      <xs:attribute name='Content' type='xs:anyURI'/>
      <xs:anyAttribute namespace='##other' processContents='lax'/>
    </xs:complexType>
  </xs:element>

  <!-- Metadata -->
  <xs:element name='Metadata'>
    <xs:complexType>
      <xs:sequence>
        <xs:element ref='tns:MetadataSection'
                    minOccurs='0'
                    maxOccurs='unbounded'/>
        <xs:any namespace='##other' processContents='lax'
                minOccurs='0'
                maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax'/>
    </xs:complexType>
  </xs:element>

  <xs:element name='MetadataSection'>
    <xs:complexType>
      <xs:choice>
        <xs:any namespace='##other' processContents='lax'/>
        <xs:element name='MetadataReference' type='wsa:EndpointReferenceType' />
        <xs:element name='MetadataLocation' type='tns:URI'/>
      </xs:choice>
      <xs:attribute name='Dialect' type='tns:QNameSerialization' use='required'/>
      <xs:attribute name='Identifier' type='xs:anyURI' use='required'/>
      <xs:anyAttribute namespace='##other' processContents='lax'/>
    </xs:complexType>
  </xs:element>

  <xs:complexType name='LocationType'>
    <xs:sequence>
      <xs:any namespace='##other' processContents='lax' minOccurs='0'
              maxOccurs='unbounded'/>
    </xs:sequence>
    <xs:attribute name='URL'  type='xs:anyURI' use='required'/>
    <xs:attribute name='Type' type='tns:QNameSerialization'  use='required'/>
    <xs:attribute name='Identifier' type='xs:anyURI' use='required'/>
    <xs:anyAttribute namespace='##other' processContents='lax'/>
  </xs:complexType>
  <xs:element name='Location' type='tns:LocationType'/>

  <xs:complexType name='ReferenceType'>
    <xs:complexContent>
      <xs:extension base='wsa:EndpointReferenceType'>
        <xs:attribute name='Type' type='tns:QNameSerialization'  use='required'/>
        <xs:attribute name='Identifier' type='xs:anyURI' use='required'/>
        <xs:anyAttribute processContents='lax'/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Reference' type='tns:ReferenceType'/>

  <!-- Policy -->
  <xs:complexType name='URI'>
    <xs:simpleContent>
      <xs:extension base='xs:anyURI'>
        <xs:anyAttribute namespace='##other' processContents='lax'/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:element name='MetadataExchange'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='GetMetadataSupported' minOccurs='0'>
          <xs:complexType>
            <xs:sequence>
              <xs:element name='MetadataExchangeDialect' 
                          minOccurs='0' maxOccurs='unbounded'>
                <xs:complexType>
                  <xs:sequence>
                    <xs:element name='MetadataContent' 
                                minOccurs='0' maxOccurs='unbounded'>
                      <xs:complexType>
                        <xs:sequence>
                          <xs:any namespace='##other' processContents='lax' 
                                  minOccurs='0' maxOccurs='0'/>
                        </xs:sequence>
                        <xs:attribute name='URI' type='xs:anyURI' 
                                                 use='required' />
                        <xs:anyAttribute namespace="##other" 
                                         processContents='lax'/>
                      </xs:complexType>
                    </xs:element>
                    <xs:any namespace='##other' processContents='lax'
                            minOccurs='0' maxOccurs='unbounded'/>
                  </xs:sequence>
                  <xs:attribute name='URI' type='xs:anyURI' 
                                use='required'/>
                  <xs:anyAttribute namespace='##other' 
                                   processContents='lax'/>
                </xs:complexType>
              </xs:element>
              <xs:any namespace='##other' processContents='lax' 
                      minOccurs='0' maxOccurs='unbounded'/>
            </xs:sequence>
            <xs:anyAttribute namespace='##other' processContents='lax' />
          </xs:complexType>
        </xs:element>
        <xs:element name='PutMetadataSupported' minOccurs='0'>
          <xs:complexType>
            <xs:sequence>
              <xs:element name='MetadataExchangeDialect' 
                          minOccurs='0' maxOccurs='unbounded'>
                <xs:complexType>
                  <xs:sequence>
                    <xs:element name='MetadataContent' 
                                minOccurs='0' maxOccurs='unbounded'>
                      <xs:complexType>
                        <xs:sequence>
                          <xs:any namespace='##other' processContents='lax' 
                                  minOccurs='0' maxOccurs='0'/>
                        </xs:sequence>
                        <xs:attribute name='URI' type='xs:anyURI' 
                                                 use='required' />
                        <xs:anyAttribute namespace="##other" 
                                         processContents='lax'/>
                      </xs:complexType>
                    </xs:element>
                    <xs:any namespace='##other' processContents='lax'
                            minOccurs='0' maxOccurs='unbounded'/>
                  </xs:sequence>
                  <xs:attribute name='URI' type='xs:anyURI' 
                                use='required'/>
                  <xs:anyAttribute namespace='##other' 
                                   processContents='lax'/>
                </xs:complexType>
              </xs:element>
              <xs:any namespace='##other' processContents='lax' 
                      minOccurs='0' maxOccurs='unbounded'/>
            </xs:sequence>
            <xs:anyAttribute namespace='##other' processContents='lax' />
          </xs:complexType>
        </xs:element>
        <xs:element name='DeleteMetadataSupported' minOccurs='0'>
          <xs:complexType>
            <xs:sequence>
              <xs:element name='MetadataExchangeDialect' 
                          minOccurs='0' maxOccurs='unbounded'>
                <xs:complexType>
                  <xs:sequence>
                    <xs:element name='MetadataContent' 
                                minOccurs='0' maxOccurs='unbounded'>
                      <xs:complexType>
                        <xs:sequence>
                          <xs:any namespace='##other' processContents='lax' 
                                  minOccurs='0' maxOccurs='0'/>
                        </xs:sequence>
                        <xs:attribute name='URI' type='xs:anyURI' 
                                                 use='required' />
                        <xs:anyAttribute namespace="##other" 
                                         processContents='lax'/>
                      </xs:complexType>
                    </xs:element>
                    <xs:any namespace='##other' processContents='lax'
                            minOccurs='0' maxOccurs='unbounded'/>
                  </xs:sequence>
                  <xs:attribute name='URI' type='xs:anyURI' 
                                use='required'/>
                  <xs:anyAttribute namespace='##other' 
                                   processContents='lax'/>
                </xs:complexType>
              </xs:element>
              <xs:any namespace='##other' processContents='lax' 
                      minOccurs='0' maxOccurs='unbounded'/>
            </xs:sequence>
            <xs:anyAttribute namespace='##other' processContents='lax' />
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

</xs:schema>