added XACML samples used in the doc

doc/xacml.samples/pdp.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<pdp xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://authzforce.github.io/core/xmlns/pdp/6.0" version="6.0.0">
+   <rootPolicyProvider id="rootPolicyProvider" xsi:type="StaticRootPolicyProvider" policyLocation="${PARENT_DIR}/policy.xml" />
+   <ioProcChain>
+      <requestPreproc>urn:ow2:authzforce:feature:pdp:request-preproc:xacml-json:default-lax</requestPreproc>
+      <resultPostproc>urn:ow2:authzforce:feature:pdp:result-postproc:xacml-json:default</resultPostproc>
+   </ioProcChain>
+</pdp>
+

doc/xacml.samples/policy.xml

+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<PolicySet
+ xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17"
+ PolicySetId="root"
+ Version="1.0"
+ PolicyCombiningAlgId="urn:oasis:names:tc:xacml:3.0:policy-combining-algorithm:deny-unless-permit">
+ <Description>Sample PolicySet</Description>
+ <Target />
+ <Policy
+  PolicyId="MissionManagementApp"
+  Version="1.0"
+  RuleCombiningAlgId="urn:oasis:names:tc:xacml:3.0:rule-combining-algorithm:deny-unless-permit">
+  <Description>Policy for MissionManagementApp</Description>
+  <Target>
+   <AnyOf>
+    <AllOf>
+     <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
+      <AttributeValue
+       DataType="http://www.w3.org/2001/XMLSchema#string">MissionManagementApp</AttributeValue>
+      <AttributeDesignator
+       Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource"
+       AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id"
+       DataType="http://www.w3.org/2001/XMLSchema#string"
+       MustBePresent="true" />
+     </Match>
+    </AllOf>
+   </AnyOf>
+  </Target>
+  <Rule RuleId="MissionManager_role_can_manage_team" Effect="Permit">
+   <Description>Only MissionManager role authorized to manage the mission team</Description>
+   <Target>
+    <AnyOf>
+     <AllOf>
+      <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
+       <AttributeValue
+        DataType="http://www.w3.org/2001/XMLSchema#string">Team</AttributeValue>
+       <AttributeDesignator
+        Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource"
+        AttributeId="urn:thales:xacml:2.0:resource:sub-resource-id"
+        DataType="http://www.w3.org/2001/XMLSchema#string"
+        MustBePresent="true" />
+      </Match>
+     </AllOf>
+    </AnyOf>
+    <AnyOf>
+     <AllOf>
+      <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
+       <AttributeValue
+        DataType="http://www.w3.org/2001/XMLSchema#string">manage</AttributeValue>
+       <AttributeDesignator
+        Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action"
+        AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id"
+        DataType="http://www.w3.org/2001/XMLSchema#string"
+        MustBePresent="true" />
+      </Match>
+     </AllOf>
+    </AnyOf>
+   </Target>
+   <Condition>
+    <Apply FunctionId="urn:oasis:names:tc:xacml:3.0:function:any-of">
+     <Function FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-equal" />
+      <AttributeValue
+       DataType="http://www.w3.org/2001/XMLSchema#string">Manager</AttributeValue>
+      <AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:2.0:subject:role"
+       DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="false"
+       Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject" />
+    </Apply>
+   </Condition>
+  </Rule>
+ </Policy>
+</PolicySet>
+

doc/xacml.samples/request_expect_deny.xml

+<?xml version='1.0' encoding='UTF-8' standalone='yes'?>
+<Request xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17"
+ CombinedDecision="false" ReturnPolicyIdList="false">
+ <Attributes
+  Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject">
+  <Attribute
+   AttributeId="urn:oasis:names:tc:xacml:1.0:subject:subject-id"
+   IncludeInResult="false">
+   <AttributeValue
+   DataType="http://www.w3.org/2001/XMLSchema#string">joe</AttributeValue>
+  </Attribute>
+  <Attribute AttributeId="urn:oasis:names:tc:xacml:2.0:subject:role"
+   IncludeInResult="false"> <AttributeValue
+   DataType="http://www.w3.org/2001/XMLSchema#string">Operator</AttributeValue>
+  </Attribute>
+ </Attributes>
+ <Attributes
+  Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource">
+  <Attribute
+   AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id"
+   IncludeInResult="false">
+   <AttributeValue
+    DataType="http://www.w3.org/2001/XMLSchema#string">MissionManagementApp</AttributeValue>
+  </Attribute>
+  <Attribute
+   AttributeId="urn:thales:xacml:2.0:resource:sub-resource-id" IncludeInResult="false">
+   <AttributeValue
+    DataType="http://www.w3.org/2001/XMLSchema#string">Team</AttributeValue>
+  </Attribute>
+ </Attributes>
+ <Attributes
+  Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
+  <Attribute
+   AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id"
+   IncludeInResult="false">
+   <AttributeValue
+    DataType="http://www.w3.org/2001/XMLSchema#string">manage</AttributeValue>
+  </Attribute>
+ </Attributes>
+ <Attributes
+  Category="urn:oasis:names:tc:xacml:3.0:attribute-category:environment" />
+</Request>
+

doc/xacml.samples/request_expect_permit.xml

+<?xml version='1.0' encoding='UTF-8' standalone='yes'?>
+<Request xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17"
+ CombinedDecision="false" ReturnPolicyIdList="false">
+ <Attributes
+  Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject">
+  <Attribute
+   AttributeId="urn:oasis:names:tc:xacml:1.0:subject:subject-id"
+   IncludeInResult="false">
+   <AttributeValue
+   DataType="http://www.w3.org/2001/XMLSchema#string">joe</AttributeValue>
+  </Attribute>
+  <Attribute AttributeId="urn:oasis:names:tc:xacml:2.0:subject:role"
+   IncludeInResult="false"> <AttributeValue
+   DataType="http://www.w3.org/2001/XMLSchema#string">Manager</AttributeValue>
+  </Attribute>
+ </Attributes>
+ <Attributes
+  Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource">
+  <Attribute
+   AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id"
+   IncludeInResult="false">
+   <AttributeValue
+    DataType="http://www.w3.org/2001/XMLSchema#string">MissionManagementApp</AttributeValue>
+  </Attribute>
+  <Attribute
+   AttributeId="urn:thales:xacml:2.0:resource:sub-resource-id" IncludeInResult="false">
+   <AttributeValue
+    DataType="http://www.w3.org/2001/XMLSchema#string">Team</AttributeValue>
+  </Attribute>
+ </Attributes>
+ <Attributes
+  Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
+  <Attribute
+   AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id"
+   IncludeInResult="false">
+   <AttributeValue
+    DataType="http://www.w3.org/2001/XMLSchema#string">manage</AttributeValue>
+  </Attribute>
+ </Attributes>
+ <Attributes
+  Category="urn:oasis:names:tc:xacml:3.0:attribute-category:environment" />
+</Request>
+