<xs:schema
    targetNamespace='http://www.w3.org/2010/03/ws-enu'
    xmlns:tns='http://www.w3.org/2010/03/ws-enu'
    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/XML/1998/namespace'
    schemaLocation='http://www.w3.org/2001/xml.xsd' />
  <xs:import
    namespace='http://www.w3.org/2005/08/addressing'
    schemaLocation='http://www.w3.org/2005/08/addressing/ws-addr.xsd' />

  <!-- Types and global elements -->
  <xs:complexType name='FilterType' mixed='true'>
    <xs:sequence>
      <xs:any namespace='##other' processContents='lax'
              minOccurs='0' maxOccurs='unbounded' />
    </xs:sequence>
    <xs:attribute name='Dialect' type='xs:anyURI' use='optional'
                  default='http://www.w3.org/2010/03/ws-enu/Dialects/XPath10'/>
    <xs:anyAttribute namespace='##other' processContents='lax' />
  </xs:complexType>

  <xs:simpleType name='PositiveDurationType'>
    <xs:restriction base='xs:duration'>
      <xs:minExclusive value='P0Y0M0DT0H0M0S' />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name='NonNegativeDurationType'>
    <xs:restriction base='xs:duration'>
      <xs:minInclusive value='P0Y0M0DT0H0M0S' />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name='DurationDateTime'>
    <xs:union memberTypes='xs:dateTime tns:NonNegativeDurationType' />
  </xs:simpleType>

  <xs:complexType name='MiniExpirationType'>
    <xs:simpleContent>
      <xs:extension base='tns:DurationDateTime'>
        <xs:anyAttribute namespace='##other' processContents='lax'/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:complexType name='ExpirationType'>
    <xs:simpleContent>
      <xs:extension base='tns:MiniExpirationType'>
        <xs:attribute name='min' type='tns:DurationDateTime' use='optional'/>
        <xs:attribute name='max' type='tns:DurationDateTime' use='optional'/>
        <xs:attribute name='exact' type='xs:boolean' use='optional'/>
        <xs:anyAttribute namespace='##other' processContents='lax'/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:complexType name='EnumerationContextType'>
    <xs:complexContent mixed='true'>
      <xs:restriction base='xs:anyType'>
        <xs:sequence>
          <xs:any namespace='##other' processContents='lax'
                  minOccurs='0' maxOccurs='unbounded' />
        </xs:sequence>
        <xs:anyAttribute namespace='##other' processContents='lax' />
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name='ItemListType'>
    <xs:sequence maxOccurs='unbounded'>
      <xs:any namespace='##other' processContents='lax'
              minOccurs='0' maxOccurs='unbounded' />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name='LanguageSpecificStringType'>
    <xs:simpleContent>
      <xs:extension base='xs:string'>
        <xs:attribute ref='xml:lang' />
        <xs:anyAttribute namespace='##other' processContents='lax' />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- Enumerate request -->
  <xs:element name='Enumerate'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='EndTo' type='wsa:EndpointReferenceType'
                    minOccurs='0' />
        <xs:element name='Expires' type='tns:ExpirationType' 
                    minOccurs='0' />
        <xs:element name='Filter' type='tns:FilterType' 
                    minOccurs='0' />
        <xs:any namespace='##other' processContents='lax' 
                minOccurs='0' maxOccurs='unbounded' />
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax' />
    </xs:complexType>
  </xs:element>

  <!-- Used for a fault response -->
  <xs:element name='SupportedDialect' type='xs:anyURI' />

  <!-- Enumerate response -->
  <xs:element name='EnumerateResponse'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='GrantedExpires' type='tns:MiniExpirationType' 
                    minOccurs='0' />
        <xs:element name='EnumerationContext' 
                    type='tns:EnumerationContextType' />
        <xs:any namespace='##other' processContents='lax' 
                minOccurs='0' maxOccurs='unbounded' />
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax' />
    </xs:complexType>
  </xs:element>

  <!-- Pull request -->
  <xs:element name='Pull'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='EnumerationContext' 
                    type='tns:EnumerationContextType' />
        <xs:element name='MaxTime' type='tns:PositiveDurationType' 
                    minOccurs='0' />
        <xs:element name='MaxElements' type='xs:positiveInteger' 
                    minOccurs='0' />
        <xs:element name='MaxCharacters' type='xs:positiveInteger' 
                    minOccurs='0' />
        <xs:element name='EndToSupported' type='tns:Empty' minOccurs='0' />
        <xs:any namespace='##other' processContents='lax' 
                minOccurs='0' maxOccurs='unbounded' />
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax' />
    </xs:complexType>
  </xs:element>

  <!-- Pull response -->
  <xs:element name='PullResponse'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='EnumerationContext' 
                    type='tns:EnumerationContextType' 
                    minOccurs='0' />
        <xs:element name='Items' type='tns:ItemListType' 
                    minOccurs='0' />
        <xs:element name='EndOfSequence' minOccurs='0' />
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax' />
    </xs:complexType>
  </xs:element>

  <!-- Renew request -->
  <xs:element name='Renew'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='EnumerationContext' 
                    type='tns:EnumerationContextType' />
        <xs:element name='Expires' type='tns:ExpirationType' 
                    minOccurs='0' />
        <xs:any namespace='##other' processContents='lax' 
                minOccurs='0' maxOccurs='unbounded' />
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax' />
    </xs:complexType>
  </xs:element>

  <!-- Renew response -->
  <xs:element name='RenewResponse'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='GrantedExpires' type='tns:MiniExpirationType' 
                    minOccurs='0' />
        <xs:element name='EnumerationContext' 
                    type='tns:EnumerationContextType' 
                    minOccurs='0' />
        <xs:any namespace='##other' processContents='lax' 
                minOccurs='0' maxOccurs='unbounded' />
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax' />
    </xs:complexType>
  </xs:element>

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

  <!-- GetStatus response -->
  <xs:element name='GetStatusResponse'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='GrantedExpires' type='tns:MiniExpirationType'
                    minOccurs='0' />
        <xs:any namespace='##other' processContents='lax' 
                minOccurs='0' maxOccurs='unbounded' />
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax' />
    </xs:complexType>
  </xs:element>

  <!-- Release request -->
  <xs:element name='Release'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='EnumerationContext' 
                    type='tns:EnumerationContextType' />
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax' />
    </xs:complexType>
  </xs:element>

  <!-- Release response -->
  <xs:element name='ReleaseResponse'>
    <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>

  <!-- EnumerationEnd message -->
  <xs:element name='EnumerationEnd'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='Code' type='tns:OpenEnumerationEndCodeType' />
        <xs:element name='Reason' type='tns:LanguageSpecificStringType' 
                    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:simpleType name='EnumerationEndCodeType'>
    <xs:restriction base='xs:anyURI'>
      <xs:enumeration value=
        'http://www.w3.org/2010/03/ws-enu/SourceShuttingDown' />
      <xs:enumeration value=
        'http://www.w3.org/2010/03/ws-enu/SourceCancelling' />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name='OpenEnumerationEndCodeType'>
    <xs:union memberTypes='tns:EnumerationEndCodeType xs:anyURI' />
  </xs:simpleType>

  <!-- Policy -->
  <xs:complexType name='Duration'>
    <xs:simpleContent>
      <xs:extension base='tns:NonNegativeDurationType'>
       <xs:anyAttribute namespace='##other'/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:complexType name='URI'>
    <xs:simpleContent>
      <xs:extension base='xs:anyURI'>
        <xs:anyAttribute namespace='##other'/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:complexType name='Long'>
    <xs:simpleContent>
      <xs:extension base='xs:long'>
        <xs:anyAttribute namespace='##other'/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:complexType name='Empty'>
    <xs:sequence/>
    <xs:anyAttribute namespace='##other' processContents='lax'/>
  </xs:complexType>

  <xs:element name='DataSource'>
    <xs:complexType>
      <xs:sequence>
        <xs:element name='FilterDialect' 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:element name='MaxExpires' type='tns:Duration' minOccurs='0'/>
        <xs:element name='MaxTime' type='tns:Duration' minOccurs='0'/>
        <xs:element name='MaxElements' type='tns:Long' minOccurs='0'/>
        <xs:element name='MaxCharacters' type='tns:Long' minOccurs='0'/>
        <xs:any namespace='##other' processContents='lax' minOccurs='0'
                                    maxOccurs='unbounded'/>
      </xs:sequence>
      <xs:anyAttribute namespace='##other' processContents='lax' />
    </xs:complexType>
  </xs:element>

</xs:schema>