<?xml version="1.0" encoding="utf-8"?>
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<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'
           xmlns:wsse='http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd'
           xmlns:wsu='http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd'
           xmlns:wsa='http://www.w3.org/2005/08/addressing'
           xmlns:wst='http://docs.oasis-open.org/ws-sx/ws-trust/200512'
           targetNamespace='http://docs.oasis-open.org/ws-sx/ws-trust/200512'
           elementFormDefault='qualified'>

  <xs:import namespace='http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd'
             schemaLocation='http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd'/>
  <xs:import namespace='http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd'
             schemaLocation='http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd'/>
  <xs:import namespace='http://schemas.xmlsoap.org/ws/2004/09/policy'
             schemaLocation='http://schemas.xmlsoap.org/ws/2004/09/policy/ws-policy.xsd'/>
  <xs:import namespace='http://www.w3.org/2005/08/addressing'
             schemaLocation='http://www.w3.org/2006/03/addressing/ws-addr.xsd'/>

  <!-- WS-Trust Section 3.1 -->
  <xs:element name='RequestSecurityToken' type='wst:RequestSecurityTokenType'/>
  <xs:complexType name='RequestSecurityTokenType'>
    <xs:annotation>
      <xs:documentation>
        Actual content model is non-deterministic, hence wildcard. The following shows intended content model:

        &lt;xs:element ref='wst:TokenType' minOccurs='0' />
        &lt;xs:element ref='wst:RequestType' />
        &lt;xs:element ref='wsp:AppliesTo' minOccurs='0' />
        &lt;xs:element ref='wst:Claims' minOccurs='0' />
        &lt;xs:element ref='wst:Entropy' minOccurs='0' />
        &lt;xs:element ref='wst:Lifetime' minOccurs='0' />
        &lt;xs:element ref='wst:AllowPostdating' minOccurs='0' />
        &lt;xs:element ref='wst:Renewing' minOccurs='0' />
        &lt;xs:element ref='wst:OnBehalfOf' minOccurs='0' />
        &lt;xs:element ref='wst:Issuer' minOccurs='0' />
        &lt;xs:element ref='wst:AuthenticationType' minOccurs='0' />
        &lt;xs:element ref='wst:KeyType' minOccurs='0' />
        &lt;xs:element ref='wst:KeySize' minOccurs='0' />
        &lt;xs:element ref='wst:SignatureAlgorithm' minOccurs='0' />
        &lt;xs:element ref='wst:Encryption' minOccurs='0' />
        &lt;xs:element ref='wst:EncryptionAlgorithm' minOccurs='0' />
        &lt;xs:element ref='wst:CanonicalizationAlgorithm' minOccurs='0' />
        &lt;xs:element ref='wst:ProofEncryption' minOccurs='0' />
        &lt;xs:element ref='wst:UseKey' minOccurs='0' />
        &lt;xs:element ref='wst:SignWith' minOccurs='0' />
        &lt;xs:element ref='wst:EncryptWith' minOccurs='0' />
        &lt;xs:element ref='wst:DelegateTo' minOccurs='0' />
        &lt;xs:element ref='wst:Forwardable' minOccurs='0' />
        &lt;xs:element ref='wst:Delegatable' minOccurs='0' />
        &lt;xs:element ref='wsp:Policy' minOccurs='0' />
        &lt;xs:element ref='wsp:PolicyReference' minOccurs='0' />
        &lt;xs:any namespace='##other' processContents='lax' minOccurs='0' maxOccurs='unbounded' />

      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax' minOccurs='0' maxOccurs='unbounded'/>
    </xs:sequence>
    <xs:attribute name='Context' type='xs:anyURI' use='optional'/>
    <xs:anyAttribute namespace='##other' processContents='lax'/>
  </xs:complexType>

  <xs:element name='TokenType' type='xs:anyURI'/>

  <xs:element name='RequestType' type='wst:RequestTypeOpenEnum'/>

  <xs:simpleType name='RequestTypeOpenEnum'>
    <xs:union memberTypes='wst:RequestTypeEnum xs:anyURI'/>
  </xs:simpleType>

  <xs:simpleType name='RequestTypeEnum'>
    <xs:restriction base='xs:anyURI'>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/Issue'/>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/Renew'/>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/Cancel'/>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/STSCancel'/>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/Validate'/>
    </xs:restriction>
  </xs:simpleType>

  <!-- WS-Trust Section 3.2 -->
  <xs:element name='RequestSecurityTokenResponse' type='wst:RequestSecurityTokenResponseType'/>
  <xs:complexType name='RequestSecurityTokenResponseType'>
    <xs:annotation>
      <xs:documentation>
        Actual content model is non-deterministic, hence wildcard. The following shows intended content model:

        &lt;xs:element ref='wst:TokenType' minOccurs='0' />
        &lt;xs:element ref='wst:RequestType' />
        &lt;xs:element ref='wst:RequestedSecurityToken' minOccurs='0' />
        &lt;xs:element ref='wsp:AppliesTo' minOccurs='0' />
        &lt;xs:element ref='wst:RequestedAttachedReference' minOccurs='0' />
        &lt;xs:element ref='wst:RequestedUnattachedReference' minOccurs='0' />
        &lt;xs:element ref='wst:RequestedProofToken' minOccurs='0' />
        &lt;xs:element ref='wst:Entropy' minOccurs='0' />
        &lt;xs:element ref='wst:Lifetime' minOccurs='0' />
        &lt;xs:element ref='wst:Status' minOccurs='0' />
        &lt;xs:element ref='wst:AllowPostdating' minOccurs='0' />
        &lt;xs:element ref='wst:Renewing' minOccurs='0' />
        &lt;xs:element ref='wst:OnBehalfOf' minOccurs='0' />
        &lt;xs:element ref='wst:Issuer' minOccurs='0' />
        &lt;xs:element ref='wst:AuthenticationType' minOccurs='0' />
        &lt;xs:element ref='wst:Authenticator' minOccurs='0' />
        &lt;xs:element ref='wst:KeyType' minOccurs='0' />
        &lt;xs:element ref='wst:KeySize' minOccurs='0' />
        &lt;xs:element ref='wst:SignatureAlgorithm' minOccurs='0' />
        &lt;xs:element ref='wst:Encryption' minOccurs='0' />
        &lt;xs:element ref='wst:EncryptionAlgorithm' minOccurs='0' />
        &lt;xs:element ref='wst:CanonicalizationAlgorithm' minOccurs='0' />
        &lt;xs:element ref='wst:ProofEncryption' minOccurs='0' />
        &lt;xs:element ref='wst:UseKey' minOccurs='0' />
        &lt;xs:element ref='wst:SignWith' minOccurs='0' />
        &lt;xs:element ref='wst:EncryptWith' minOccurs='0' />
        &lt;xs:element ref='wst:DelegateTo' minOccurs='0' />
        &lt;xs:element ref='wst:Forwardable' minOccurs='0' />
        &lt;xs:element ref='wst:Delegatable' minOccurs='0' />
        &lt;xs:element ref='wsp:Policy' minOccurs='0' />
        &lt;xs:element ref='wsp:PolicyReference' minOccurs='0' />
        &lt;xs:any namespace='##other' processContents='lax' minOccurs='0' maxOccurs='unbounded' />

      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax' minOccurs='0' maxOccurs='unbounded'/>
    </xs:sequence>
    <xs:attribute name='Context' type='xs:anyURI' use='optional'/>
    <xs:anyAttribute namespace='##other' processContents='lax'/>
  </xs:complexType>

  <xs:element name='RequestedSecurityToken' type='wst:RequestedSecurityTokenType'/>
  <xs:complexType name='RequestedSecurityTokenType'>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax'/>
    </xs:sequence>
  </xs:complexType>

  <!-- WS-Trust Section 3.3 -->
  <xs:element name='BinarySecret' type='wst:BinarySecretType'/>
  <xs:complexType name='BinarySecretType'>
    <xs:simpleContent>
      <xs:extension base='xs:base64Binary'>
        <xs:attribute name='Type' type='wst:BinarySecretTypeOpenEnum' use='optional'/>
        <xs:anyAttribute namespace='##other' processContents='lax'/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name='BinarySecretTypeEnum'>
    <xs:restriction base='xs:anyURI'>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/AsymmetricKey'/>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/SymmetricKey'/>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/Nonce'/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name='BinarySecretTypeOpenEnum'>
    <xs:union memberTypes='wst:BinarySecretTypeEnum xs:anyURI'/>
  </xs:simpleType>


  <!-- WS-Trust Section 4.1 -->
  <xs:element name='Claims' type='wst:ClaimsType'/>
  <xs:complexType name='ClaimsType'>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax' minOccurs='0' maxOccurs='unbounded'/>
    </xs:sequence>
    <xs:attribute name='Dialect' type='xs:anyURI' use='optional'/>
    <xs:anyAttribute namespace='##other' processContents='lax'/>
  </xs:complexType>

  <xs:element name='Entropy' type='wst:EntropyType'/>
  <xs:complexType name='EntropyType'>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax' minOccurs='0' maxOccurs='unbounded'/>
    </xs:sequence>
    <xs:anyAttribute namespace='##other' processContents='lax'/>
  </xs:complexType>

  <xs:element name='Lifetime' type='wst:LifetimeType'/>
  <xs:complexType name='LifetimeType'>
    <xs:sequence>
      <xs:element ref='wsu:Created' minOccurs='0'/>
      <xs:element ref='wsu:Expires' minOccurs='0'/>
    </xs:sequence>
  </xs:complexType>

  <!-- WS-Trust Section 4.2 -->
  <xs:element name='RequestSecurityTokenCollection' type='wst:RequestSecurityTokenCollectionType'/>
  <xs:complexType name='RequestSecurityTokenCollectionType'>
    <xs:annotation>
      <xs:documentation>
        The RequestSecurityTokenCollection (RSTC) element is used to provide multiple RST requests.
        One or more RSTR elements in an RSTRC element are returned in the response to the
        RequestSecurityTokenCollection.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='RequestSecurityToken' type='wst:RequestSecurityTokenType' minOccurs='2' maxOccurs='unbounded'/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name='RequestSecurityTokenResponseCollection' type='wst:RequestSecurityTokenResponseCollectionType'/>
  <xs:complexType name='RequestSecurityTokenResponseCollectionType'>
    <xs:annotation>
      <xs:documentation>
        The &lt;wst:RequestSecurityTokenResponseCollection> element (RSTRC) MUST be used to return a security token or
        response to a security token request on the final response.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref='wst:RequestSecurityTokenResponse' minOccurs='1' maxOccurs='unbounded'/>
    </xs:sequence>
    <xs:anyAttribute namespace='##other' processContents='lax'/>
  </xs:complexType>

  <!-- WS-Trust Section 4.3 -->
  <xs:element name='ComputedKey' type='wst:ComputedKeyOpenEnum'/>
  <xs:simpleType name='ComputedKeyEnum'>
    <xs:restriction base='xs:anyURI'>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/CK/PSHA1'/>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/CK/HASH'/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name='ComputedKeyOpenEnum'>
    <xs:union memberTypes='wst:ComputedKeyEnum xs:anyURI'/>
  </xs:simpleType>

  <xs:element name='RequestedAttachedReference' type='wst:RequestedReferenceType'/>
  <xs:element name='RequestedUnattachedReference' type='wst:RequestedReferenceType'/>
  <xs:complexType name='RequestedReferenceType'>
    <xs:sequence>
      <xs:element ref='wsse:SecurityTokenReference'/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name='RequestedProofToken' type='wst:RequestedProofTokenType'/>
  <xs:complexType name='RequestedProofTokenType'>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax'/>
    </xs:sequence>
  </xs:complexType>

  <!-- WS-Trust Section 6.4 -->
  <xs:element name='IssuedTokens' type='wst:RequestSecurityTokenResponseCollectionType'/>

  <!-- WS-Trust Section 5 -->
  <xs:element name='RenewTarget' type='wst:RenewTargetType'/>
  <xs:complexType name='RenewTargetType'>
    <xs:sequence>
      <xs:any namespace='##other' minOccurs='1' maxOccurs='1'/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name='AllowPostdating' type='wst:AllowPostdatingType'/>
  <xs:complexType name='AllowPostdatingType'/>

  <xs:element name='Renewing' type='wst:RenewingType'/>
  <xs:complexType name='RenewingType'>
    <xs:attribute name='Allow' type='xs:boolean' use='optional'/>
    <xs:attribute name='OK' type='xs:boolean' use='optional'/>
  </xs:complexType>

  <!-- WS-Trust Section 6 -->
  <xs:element name='CancelTarget' type='wst:CancelTargetType'/>
  <xs:complexType name='CancelTargetType'>
    <xs:sequence>
      <xs:any namespace='##other' minOccurs='1' maxOccurs='1'/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name='RequestedTokenCancelled' type='wst:RequestedTokenCancelledType'/>
  <xs:complexType name='RequestedTokenCancelledType'/>

  <!-- WS-Trust Section 7 -->
  <xs:element name='ValidateTarget' type='wst:ValidateTargetType'/>
  <xs:complexType name='ValidateTargetType'>
    <xs:sequence>
      <xs:any namespace='##other' minOccurs='1' maxOccurs='1'/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name='Status' type='wst:StatusType'/>
  <xs:complexType name='StatusType'>
    <xs:sequence>
      <xs:element name='Code' type='wst:StatusCodeOpenEnum'/>
      <xs:element name='Reason' type='xs:string' minOccurs='0'/>
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name='StatusCodeEnum'>
    <xs:restriction base='xs:anyURI'>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/status/valid'/>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/status/invalid'/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name='StatusCodeOpenEnum'>
    <xs:union memberTypes='wst:StatusCodeEnum xs:anyURI'/>
  </xs:simpleType>

  <!-- WS-Trust Section 8.2 -->
  <xs:element name='SignChallenge' type='wst:SignChallengeType'/>
  <xs:element name='SignChallengeResponse' type='wst:SignChallengeType'/>
  <xs:complexType name='SignChallengeType'>
    <xs:sequence>
      <xs:element ref='wst:Challenge'/>
      <xs:any namespace='##any' processContents='lax' minOccurs='0' maxOccurs='unbounded'/>
    </xs:sequence>
    <xs:anyAttribute namespace='##any' processContents='lax'/>
  </xs:complexType>

  <xs:element name='Challenge' type='xs:string'/>


  <!-- WS-Trust Section 8.3 -->
  <xs:element name='BinaryExchange' type='wst:BinaryExchangeType'/>
  <xs:complexType name='BinaryExchangeType'>
    <xs:simpleContent>
      <xs:extension base='xs:string'>
        <xs:attribute name='ValueType' type='xs:anyURI' use='required'/>
        <xs:attribute name='EncodingType' type='xs:anyURI' use='required'/>
        <xs:anyAttribute namespace='##other' processContents='lax'/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- WS-Trust Section 8.4 -->
  <xs:element name='RequestKET' type='wst:RequestKETType'/>
  <xs:complexType name='RequestKETType'/>

  <xs:element name='KeyExchangeToken' type='wst:KeyExchangeTokenType'/>
  <xs:complexType name='KeyExchangeTokenType'>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax' minOccurs='0' maxOccurs='unbounded'/>
    </xs:sequence>
  </xs:complexType>

  <!-- WS-Trust Section 8.9 -->
  <xs:element name='Authenticator' type='wst:AuthenticatorType'/>
  <xs:complexType name='AuthenticatorType'>
    <xs:sequence>
      <xs:element ref='wst:CombinedHash' minOccurs='0'/>
      <xs:any namespace='##other' processContents='lax' minOccurs='0' maxOccurs='unbounded'/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name='CombinedHash' type='xs:base64Binary'/>

  <!-- WS-Trust Section 9.1 -->
  <xs:element name='OnBehalfOf' type='wst:OnBehalfOfType'/>
  <xs:complexType name='OnBehalfOfType'>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax'/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name='Issuer' type='wsa:EndpointReferenceType'/>

  <!-- WS-Trust Section 9.2 -->
  <xs:element name='AuthenticationType' type='xs:anyURI'/>

  <xs:element name='KeyType' type='wst:KeyTypeOpenEnum'/>
  <xs:simpleType name='KeyTypeEnum'>
    <xs:restriction base='xs:anyURI'>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/PublicKey'/>
      <xs:enumeration value='http://docs.oasis-open.org/ws-sx/ws-trust/200512/SymmetricKey'/>
      <xs:enumeration value='http://docs.oasis-open.org/wssx/wstrust/200512/Bearer'/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name='KeyTypeOpenEnum'>
    <xs:union memberTypes='wst:KeyTypeEnum xs:anyURI'/>
  </xs:simpleType>

  <xs:element name='KeySize' type='xs:unsignedInt'/>

  <xs:element name='SignatureAlgorithm' type='xs:anyURI'/>
  <xs:element name='EncryptionAlgorithm' type='xs:anyURI'/>
  <xs:element name='CanonicalizationAlgorithm' type='xs:anyURI'/>
  <xs:element name='ComputedKeyAlgorithm' type='xs:anyURI'/>

  <xs:element name='Encryption' type='wst:EncryptionType'/>
  <xs:complexType name='EncryptionType'>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax'/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name='ProofEncryption' type='wst:ProofEncryptionType'/>
  <xs:complexType name='ProofEncryptionType'>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax'/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name='UseKey' type='wst:UseKeyType'/>
  <xs:complexType name='UseKeyType'>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax' minOccurs='0'/>
    </xs:sequence>
    <xs:attribute name='Sig' type='xs:anyURI' use='optional'/>
  </xs:complexType>

  <xs:element name='KeyWrapAlgorithm' type='xs:anyURI'/>
  <xs:element name='SignWith' type='xs:anyURI'/>
  <xs:element name='EncryptWith' type='xs:anyURI'/>

  <!-- WS-Trust Section 9.3 -->
  <xs:element name='DelegateTo' type='wst:DelegateToType'/>
  <xs:complexType name='DelegateToType'>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax'/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name='Forwardable' type='xs:boolean'/>
  <xs:element name='Delegatable' type='xs:boolean'/>

  <!-- WS-Trust Section 9.5 -->
  <xs:element name='Participants' type='wst:ParticipantsType'/>
  <xs:complexType name='ParticipantsType'>
    <xs:sequence>
      <xs:element name='Primary' type='wst:ParticipantType' minOccurs='0'/>
      <xs:element name='Participant' type='wst:ParticipantType' minOccurs='0' maxOccurs='unbounded'/>
      <xs:any namespace='##other' processContents='lax' minOccurs='0' maxOccurs='unbounded'/>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name='ParticipantType'>
    <xs:sequence>
      <xs:any namespace='##any' processContents='lax'/>
    </xs:sequence>
  </xs:complexType>

</xs:schema>
