-- XSD schema extracted from ITU-T X.1144 (10/2013)

<?xml version="1.0" encoding="UTF-8"?>
<!-- Copyright OASIS Open 2010. All Rights Reserved. -->
<xs:schema xmlns:xacml="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17"
	xmlns:xs="http://www.w3.org/2001/XMLSchema"
	targetNamespace="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17"
	elementFormDefault="qualified" attributeFormDefault="unqualified">

	<xs:import namespace="http://www.w3.org/XML/1998/namespace"
		schemaLocation="http://www.w3.org/2001/xml.xsd"/>

	<xs:element name="Request" type="xacml:RequestType"/>
	<xs:complexType name="RequestType">
		<xs:sequence>
			<xs:element ref="xacml:RequestDefaults" minOccurs="0"/>
			<xs:element ref="xacml:Attributes" maxOccurs="unbounded"/>
			<xs:element ref="xacml:MultiRequests" minOccurs="0"/>
		</xs:sequence>
		<xs:attribute name="ReturnPolicyIdList" type="xs:boolean" use="required" />
		<xs:attribute name="CombinedDecision" type="xs:boolean" use="required" />
	</xs:complexType>

	<xs:element name="RequestDefaults" type="xacml:RequestDefaultsType"/>
	<xs:complexType name="RequestDefaultsType">
		<xs:sequence>
			<xs:choice>
				<xs:element ref="xacml:XPathVersion"/>
			</xs:choice>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="Response" type="xacml:ResponseType"/>
	<xs:complexType name="ResponseType">
		<xs:sequence>
			<xs:element ref="xacml:Result" maxOccurs="unbounded"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="Content" type="xacml:ContentType"/>
	<xs:complexType name="ContentType" mixed="true">
		<xs:sequence>
			<xs:any namespace="##any" processContents="lax"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="Result" type="xacml:ResultType"/>
	<xs:complexType name="ResultType">
		<xs:sequence>
			<xs:element ref="xacml:Decision"/>
			<xs:element ref="xacml:Status" minOccurs="0"/>
			<xs:element ref="xacml:Obligations" minOccurs="0"/>
			<xs:element ref="xacml:AssociatedAdvice" minOccurs="0"/>
			<xs:element ref="xacml:Attributes" minOccurs="0" maxOccurs="unbounded"/>
			<xs:element ref="xacml:PolicyIdentifierList" minOccurs="0"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="PolicyIdentifierList" type="xacml:PolicyIdentifierListType"/>
	<xs:complexType name="PolicyIdentifierListType">
		<xs:choice minOccurs="0" maxOccurs="unbounded">
			<xs:element ref="xacml:PolicyIdReference"/>
			<xs:element ref="xacml:PolicySetIdReference"/>
		</xs:choice>
	</xs:complexType>

	<xs:element name="Decision" type="xacml:DecisionType"/>
	<xs:simpleType name="DecisionType">
		<xs:restriction base="xs:string">
			<xs:enumeration value="Permit"/>
			<xs:enumeration value="Deny"/>
			<xs:enumeration value="Indeterminate"/>
			<xs:enumeration value="NotApplicable"/>
		</xs:restriction>
	</xs:simpleType>

	<xs:element name="Status" type="xacml:StatusType"/>
	<xs:complexType name="StatusType">
		<xs:sequence>
			<xs:element ref="xacml:StatusCode"/>
			<xs:element ref="xacml:StatusMessage" minOccurs="0"/>
			<xs:element ref="xacml:StatusDetail" minOccurs="0"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="StatusCode" type="xacml:StatusCodeType"/>
	<xs:complexType name="StatusCodeType">
		<xs:sequence>
			<xs:element ref="xacml:StatusCode" minOccurs="0"/>
		</xs:sequence>
		<xs:attribute name="Value" type="xs:anyURI" use="required"/>
	</xs:complexType>

	<xs:element name="StatusMessage" type="xs:string"/>

	<xs:element name="StatusDetail" type="xacml:StatusDetailType"/>
	<xs:complexType name="StatusDetailType">
		<xs:sequence>
			<xs:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="MissingAttributeDetail" type="xacml:MissingAttributeDetailType"/>
	<xs:complexType name="MissingAttributeDetailType">
		<xs:sequence>
			<xs:element ref="xacml:AttributeValue" minOccurs="0" maxOccurs="unbounded"/>
		</xs:sequence>
		<xs:attribute name="Category" type="xs:anyURI" use="required"/>
		<xs:attribute name="AttributeId" type="xs:anyURI" use="required"/>
		<xs:attribute name="DataType" type="xs:anyURI" use="required"/>
		<xs:attribute name="Issuer" type="xs:string" use="optional"/>
	</xs:complexType>

	<xs:element name="Attributes" type="xacml:AttributesType"/>
	<xs:complexType name="AttributesType">
		<xs:sequence>
			<xs:element ref="xacml:Content" minOccurs="0"/>
			<xs:element ref="xacml:Attribute" minOccurs="0" maxOccurs="unbounded"/>
		</xs:sequence>
		<xs:attribute name="Category" type="xs:anyURI" use="required"/>
		<xs:attribute ref="xml:id" use="optional"/>
	</xs:complexType>

	<xs:element name="Attribute" type="xacml:AttributeType"/>
	<xs:complexType name="AttributeType">
		<xs:sequence>
			<xs:element ref="xacml:AttributeValue" maxOccurs="unbounded"/>
		</xs:sequence>
		<xs:attribute name="AttributeId" type="xs:anyURI" use="required"/>
		<xs:attribute name="Issuer" type="xs:string" use="optional"/>
		<xs:attribute name="IncludeInResult" type="xs:boolean" use="required"/>
	</xs:complexType>

	<xs:element name="MultiRequests" type="xacml:MultiRequestsType"/>
	<xs:complexType name="MultiRequestsType">
		<xs:sequence>
			<xs:element ref="xacml:RequestReference" maxOccurs="unbounded"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="RequestReference" type="xacml:RequestReferenceType"/>
	<xs:complexType name="RequestReferenceType">
		<xs:sequence>
			<xs:element ref="xacml:AttributesReference" maxOccurs="unbounded"/>
		</xs:sequence>
	</xs:complexType>
	
	<xs:element name="AttributesReference" type="xacml:AttributesReferenceType"/>
	<xs:complexType name="AttributesReferenceType">
		<xs:attribute name="ReferenceId" type="xs:IDREF" use="required" />
	</xs:complexType>
	
	<xs:element name="Obligations" type="xacml:ObligationsType"/>
	<xs:complexType name="ObligationsType">
		<xs:sequence>
			<xs:element ref="xacml:Obligation" maxOccurs="unbounded"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="AssociatedAdvice" type="xacml:AssociatedAdviceType"/>
	<xs:complexType name="AssociatedAdviceType">
		<xs:sequence>
			<xs:element ref="xacml:Advice" maxOccurs="unbounded"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="Obligation" type="xacml:ObligationType"/>
	<xs:complexType name="ObligationType">
		<xs:sequence>
			<xs:element ref="xacml:AttributeAssignment" minOccurs="0" maxOccurs="unbounded"/>
		</xs:sequence>
		<xs:attribute name="ObligationId" type="xs:anyURI" use="required"/>
	</xs:complexType>

	<xs:element name="Advice" type="xacml:AdviceType"/>
	<xs:complexType name="AdviceType">
		<xs:sequence>
			<xs:element ref="xacml:AttributeAssignment" minOccurs="0" maxOccurs="unbounded"/>
		</xs:sequence>
		<xs:attribute name="AdviceId" type="xs:anyURI" use="required"/>
	</xs:complexType>

	<xs:element name="AttributeAssignment" type="xacml:AttributeAssignmentType"/>
	<xs:complexType name="AttributeAssignmentType" mixed="true">
		<xs:complexContent mixed="true">
			<xs:extension base="xacml:AttributeValueType">
				<xs:attribute name="AttributeId" type="xs:anyURI" use="required"/>
				<xs:attribute name="Category" type="xs:anyURI" use="optional"/>
				<xs:attribute name="Issuer" type="xs:string" use="optional"/>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>

	<xs:element name="ObligationExpressions" type="xacml:ObligationExpressionsType"/>
	<xs:complexType name="ObligationExpressionsType">
		<xs:sequence>
			<xs:element ref="xacml:ObligationExpression" maxOccurs="unbounded"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="AdviceExpressions" type="xacml:AdviceExpressionsType"/>
	<xs:complexType name="AdviceExpressionsType">
		<xs:sequence>
			<xs:element ref="xacml:AdviceExpression" maxOccurs="unbounded"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="ObligationExpression" type="xacml:ObligationExpressionType"/>
	<xs:complexType name="ObligationExpressionType">
		<xs:sequence>
			<xs:element ref="xacml:AttributeAssignmentExpression" minOccurs="0" maxOccurs="unbounded"/>
		</xs:sequence>
		<xs:attribute name="ObligationId" type="xs:anyURI" use="required"/>
		<xs:attribute name="FulfillOn" type="xacml:EffectType" use="required"/>
	</xs:complexType>

	<xs:element name="AdviceExpression" type="xacml:AdviceExpressionType"/>
	<xs:complexType name="AdviceExpressionType">
		<xs:sequence>
			<xs:element ref="xacml:AttributeAssignmentExpression" minOccurs="0" maxOccurs="unbounded"/>
		</xs:sequence>
		<xs:attribute name="AdviceId" type="xs:anyURI" use="required"/>
		<xs:attribute name="AppliesTo" type="xacml:EffectType" use="required"/>
	</xs:complexType>

	<xs:element name="AttributeAssignmentExpression" type="xacml:AttributeAssignmentExpressionType"/>
	<xs:complexType name="AttributeAssignmentExpressionType">
		<xs:sequence>
			<xs:element ref="xacml:Expression"/>
		</xs:sequence>
		<xs:attribute name="AttributeId" type="xs:anyURI" use="required"/>
		<xs:attribute name="Category" type="xs:anyURI" use="optional"/>
		<xs:attribute name="Issuer" type="xs:string" use="optional"/>
	</xs:complexType>

	<xs:simpleType name="EffectType">
		<xs:restriction base="xs:string">
			<xs:enumeration value="Permit"/>
			<xs:enumeration value="Deny"/>
		</xs:restriction>
	</xs:simpleType>

	<xs:element name="PolicySet" type="xacml:PolicySetType"/>
	<xs:complexType name="PolicySetType">
		<xs:sequence>
			<xs:element ref="xacml:Description" minOccurs="0"/>
			<xs:element ref="xacml:PolicyIssuer" minOccurs="0"/>
			<xs:element ref="xacml:PolicySetDefaults" minOccurs="0"/>
			<xs:element ref="xacml:Target"/>
			<xs:choice minOccurs="0" maxOccurs="unbounded">
				<xs:element ref="xacml:PolicySet"/>
				<xs:element ref="xacml:Policy"/>
				<xs:element ref="xacml:PolicySetIdReference"/>
				<xs:element ref="xacml:PolicyIdReference"/>
				<xs:element ref="xacml:CombinerParameters"/>
				<xs:element ref="xacml:PolicyCombinerParameters"/>
				<xs:element ref="xacml:PolicySetCombinerParameters"/>
			</xs:choice>
			<xs:element ref="xacml:ObligationExpressions" minOccurs="0"/>
			<xs:element ref="xacml:AdviceExpressions" minOccurs="0"/>
		</xs:sequence>
		<xs:attribute name="PolicySetId" type="xs:anyURI" use="required"/>
		<xs:attribute name="Version" type="xacml:VersionType" use="required"/>
		<xs:attribute name="PolicyCombiningAlgId" type="xs:anyURI" use="required"/>
		<xs:attribute name="MaxDelegationDepth" type="xs:integer" use="optional"/>
	</xs:complexType>

	<xs:element name="PolicyIssuer" type="xacml:PolicyIssuerType"/>
	<xs:complexType name="PolicyIssuerType">
		<xs:sequence>
            <xs:element ref="xacml:Content" minOccurs="0"/>
			<xs:element ref="xacml:Attribute" minOccurs="0" maxOccurs="unbounded"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="CombinerParameters" type="xacml:CombinerParametersType"/>
	<xs:complexType name="CombinerParametersType">
		<xs:sequence>
			<xs:element ref="xacml:CombinerParameter" minOccurs="0" maxOccurs="unbounded"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="CombinerParameter" type="xacml:CombinerParameterType"/>
	<xs:complexType name="CombinerParameterType">
		<xs:sequence>
			<xs:element ref="xacml:AttributeValue"/>
		</xs:sequence>
		<xs:attribute name="ParameterName" type="xs:string" use="required"/>
	</xs:complexType>

	<xs:element name="RuleCombinerParameters" type="xacml:RuleCombinerParametersType"/>
	<xs:complexType name="RuleCombinerParametersType">
		<xs:complexContent>
			<xs:extension base="xacml:CombinerParametersType">
				<xs:attribute name="RuleIdRef" type="xs:string" use="required"/>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>

	<xs:element name="PolicyCombinerParameters" type="xacml:PolicyCombinerParametersType"/>
	<xs:complexType name="PolicyCombinerParametersType">
		<xs:complexContent>
			<xs:extension base="xacml:CombinerParametersType">
				<xs:attribute name="PolicyIdRef" type="xs:anyURI" use="required"/>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>

	<xs:element name="PolicySetCombinerParameters" type="xacml:PolicySetCombinerParametersType"/>
	<xs:complexType name="PolicySetCombinerParametersType">
		<xs:complexContent>
			<xs:extension base="xacml:CombinerParametersType">
				<xs:attribute name="PolicySetIdRef" type="xs:anyURI" use="required"/>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>

	<xs:element name="PolicySetIdReference" type="xacml:IdReferenceType"/>
	<xs:element name="PolicyIdReference" type="xacml:IdReferenceType"/>

	<xs:element name="PolicySetDefaults" type="xacml:DefaultsType"/>
	<xs:element name="PolicyDefaults" type="xacml:DefaultsType"/>
	<xs:complexType name="DefaultsType">
		<xs:sequence>
			<xs:choice>
				<xs:element ref="xacml:XPathVersion"/>
			</xs:choice>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="XPathVersion" type="xs:anyURI"/>

	<xs:complexType name="IdReferenceType">
		<xs:simpleContent>
			<xs:extension base="xs:anyURI">
				<xs:attribute name="Version" type="xacml:VersionMatchType" use="optional"/>
				<xs:attribute name="EarliestVersion" type="xacml:VersionMatchType" use="optional"/>
				<xs:attribute name="LatestVersion" type="xacml:VersionMatchType" use="optional"/>
			</xs:extension>
		</xs:simpleContent>
	</xs:complexType>

	<xs:simpleType name="VersionType">
		<xs:restriction base="xs:string">
			<xs:pattern value="(\d+\.)*\d+"/>
		</xs:restriction>
	</xs:simpleType>

	<xs:simpleType name="VersionMatchType">
		<xs:restriction base="xs:string">
			<xs:pattern value="((\d+|\*)\.)*(\d+|\*|\+)"/>
		</xs:restriction>
	</xs:simpleType>

	<xs:element name="Policy" type="xacml:PolicyType"/>
	<xs:complexType name="PolicyType">
		<xs:sequence>
			<xs:element ref="xacml:Description" minOccurs="0"/>
			<xs:element ref="xacml:PolicyIssuer" minOccurs="0"/>
			<xs:element ref="xacml:PolicyDefaults" minOccurs="0"/>
			<xs:element ref="xacml:Target"/>
			<xs:choice maxOccurs="unbounded">
				<xs:element ref="xacml:CombinerParameters" minOccurs="0"/>
				<xs:element ref="xacml:RuleCombinerParameters" minOccurs="0"/>
				<xs:element ref="xacml:VariableDefinition"/>
				<xs:element ref="xacml:Rule"/>
			</xs:choice>
			<xs:element ref="xacml:ObligationExpressions" minOccurs="0"/>
			<xs:element ref="xacml:AdviceExpressions" minOccurs="0"/>
		</xs:sequence>
		<xs:attribute name="PolicyId" type="xs:anyURI" use="required"/>
		<xs:attribute name="Version" type="xacml:VersionType" use="required"/>
		<xs:attribute name="RuleCombiningAlgId" type="xs:anyURI" use="required"/>
		<xs:attribute name="MaxDelegationDepth" type="xs:integer" use="optional"/>
	</xs:complexType>

	<xs:element name="Description" type="xs:string"/>

	<xs:element name="Rule" type="xacml:RuleType"/>
	<xs:complexType name="RuleType">
		<xs:sequence>
			<xs:element ref="xacml:Description" minOccurs="0"/>
			<xs:element ref="xacml:Target" minOccurs="0"/>
			<xs:element ref="xacml:Condition" minOccurs="0"/>
			<xs:element ref="xacml:ObligationExpressions" minOccurs="0"/>
			<xs:element ref="xacml:AdviceExpressions" minOccurs="0"/>
		</xs:sequence>
		<xs:attribute name="RuleId" type="xs:string" use="required"/>
		<xs:attribute name="Effect" type="xacml:EffectType" use="required"/>
	</xs:complexType>

	<xs:element name="Target" type="xacml:TargetType"/>
	<xs:complexType name="TargetType">
		<xs:sequence minOccurs="0" maxOccurs="unbounded">
			<xs:element ref="xacml:AnyOf"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="AnyOf" type="xacml:AnyOfType"/>
	<xs:complexType name="AnyOfType">
		<xs:sequence minOccurs="1" maxOccurs="unbounded">
			<xs:element ref="xacml:AllOf"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="AllOf" type="xacml:AllOfType"/>
	<xs:complexType name="AllOfType">
		<xs:sequence minOccurs="1" maxOccurs="unbounded">
			<xs:element ref="xacml:Match"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="Match" type="xacml:MatchType"/>
	<xs:complexType name="MatchType">
		<xs:sequence>
			<xs:element ref="xacml:AttributeValue"/>
			<xs:choice>
				<xs:element ref="xacml:AttributeDesignator"/>
				<xs:element ref="xacml:AttributeSelector"/>
			</xs:choice>
		</xs:sequence>
		<xs:attribute name="MatchId" type="xs:anyURI" use="required"/>
	</xs:complexType>

	<xs:element name="VariableDefinition" type="xacml:VariableDefinitionType"/>
	<xs:complexType name="VariableDefinitionType">
		<xs:sequence>
			<xs:element ref="xacml:Expression"/>
		</xs:sequence>
		<xs:attribute name="VariableId" type="xs:string" use="required"/>
	</xs:complexType>

	<xs:element name="Expression" type="xacml:ExpressionType" abstract="true"/>
	<xs:complexType name="ExpressionType" abstract="true"/>

	<xs:element name="VariableReference" type="xacml:VariableReferenceType" substitutionGroup="xacml:Expression"/>
	<xs:complexType name="VariableReferenceType">
		<xs:complexContent>
			<xs:extension base="xacml:ExpressionType">
				<xs:attribute name="VariableId" type="xs:string" use="required"/>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>

	<xs:element name="AttributeSelector" type="xacml:AttributeSelectorType" substitutionGroup="xacml:Expression"/>
	<xs:complexType name="AttributeSelectorType">
		<xs:complexContent>
			<xs:extension base="xacml:ExpressionType">
				<xs:attribute name="Category" type="xs:anyURI" use="required"/>
				<xs:attribute name="ContextSelectorId" type="xs:anyURI" use="optional"/>
				<xs:attribute name="Path" type="xs:string" use="required"/>
				<xs:attribute name="DataType" type="xs:anyURI" use="required"/>
				<xs:attribute name="MustBePresent" type="xs:boolean" use="required"/>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>

	<xs:element name="AttributeDesignator" type="xacml:AttributeDesignatorType" substitutionGroup="xacml:Expression"/>
	<xs:complexType name="AttributeDesignatorType">
		<xs:complexContent>
			<xs:extension base="xacml:ExpressionType">
				<xs:attribute name="Category" type="xs:anyURI" use="required"/>
				<xs:attribute name="AttributeId" type="xs:anyURI" use="required"/>
				<xs:attribute name="DataType" type="xs:anyURI" use="required"/>
				<xs:attribute name="Issuer" type="xs:string" use="optional"/>
				<xs:attribute name="MustBePresent" type="xs:boolean" use="required"/>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>

	<xs:element name="AttributeValue" type="xacml:AttributeValueType" substitutionGroup="xacml:Expression"/>
	<xs:complexType name="AttributeValueType" mixed="true">
		<xs:complexContent mixed="true">
			<xs:extension base="xacml:ExpressionType">
				<xs:sequence>
					<xs:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
				</xs:sequence>
				<xs:attribute name="DataType" type="xs:anyURI" use="required"/>
				<xs:anyAttribute namespace="##any" processContents="lax"/>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>

	<xs:element name="Function" type="xacml:FunctionType" substitutionGroup="xacml:Expression"/>
	<xs:complexType name="FunctionType">
		<xs:complexContent>
			<xs:extension base="xacml:ExpressionType">
				<xs:attribute name="FunctionId" type="xs:anyURI" use="required"/>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>

	<xs:element name="Condition" type="xacml:ConditionType"/>
	<xs:complexType name="ConditionType">
		<xs:sequence>
			<xs:element ref="xacml:Expression"/>
		</xs:sequence>
	</xs:complexType>

	<xs:element name="Apply" type="xacml:ApplyType" substitutionGroup="xacml:Expression"/>
	<xs:complexType name="ApplyType">
		<xs:complexContent>
			<xs:extension base="xacml:ExpressionType">
				<xs:sequence>
					<xs:element ref="xacml:Description" minOccurs="0"/>
					<xs:element ref="xacml:Expression" minOccurs="0" maxOccurs="unbounded"/>
				</xs:sequence>
				<xs:attribute name="FunctionId" type="xs:anyURI" use="required"/>
			</xs:extension>
		</xs:complexContent>
	</xs:complexType>
</xs:schema>