wso2 - How to write a XACML3 request with MULTI REQUEST in java? -

i found many different ways write xacml request in java using xacmlinfo , wso2 libraries, no way on how define attribute category "id". request i'm trying write following:

<request xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17" combineddecision="true" returnpolicyidlist="true"> <attributes category="urn:oasis:names:tc:xacml:3.0:attribute-category:action" id="action1"> <attribute attributeid="urn:oasis:names:tc:xacml:1.0:action:action-id" includeinresult="true"> <attributevalue datatype="http://www.w3.org/2001/xmlschema#string">read</attributevalue> </attribute> </attributes> <attributes category="urn:oasis:names:tc:xacml:3.0:attribute-category:action" id="action2"> <attribute attributeid="urn:oasis:names:tc:xacml:1.0:action:action-id" includeinresult="true"> <attributevalue datatype="http://www.w3.org/2001/xmlschema#string">write</attributevalue> </attribute> </attributes> <attributes category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject" id="subject1"> <attribute attributeid="urn:oasis:names:tc:xacml:1.0:subject:subject-id" includeinresult="true"> <attributevalue datatype="http://www.w3.org/2001/xmlschema#string">bart</attributevalue> </attribute> </attributes> <attributes category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject" id="subject2"> <attribute attributeid="urn:oasis:names:tc:xacml:1.0:subject:subject-id" includeinresult="true"> <attributevalue datatype="http://www.w3.org/2001/xmlschema#string">admin</attributevalue> </attribute> </attributes>     <multirequests>     <requestreference>     <attributesreference referenceid="subject1"/>     <attributesreference referenceid="action2"/>     </requestreference>     <requestreference>     <attributesreference referenceid="subject2"/>     <attributesreference referenceid="action1"/>     </requestreference>     </multirequests> </request>  

how can set attributes id referenced multirequest? code :

requestdto requestdto = new requestdto(); requestdto.setcombineddecision(true); requestdto.setreturnpolicylist(true); requestdto.setmultiplerequest(true);  attributedto subjectdto = new attributedto(); subjectdto.setattributeid("urn:oasis:names:tc:xacml:1.0:subject:subject-id"); subjectdto.setattributevalue(new string[] { jsonsingleaccess.getsubject().getusername() }); subjectdto.setdatatype("http://www.w3.org/2001/xmlschema#string"); requestdto.setattributedtos("urn:oasis:names:tc:xacml:1.0:subject-category:access-subject", new attributedto[] { subjectdto }); string req = "";     try {         req = peputils.createrequest(requestdto);     } catch (pepagentexception e) {         e.printstacktrace();     }     system.out.println(req); 

many all, antonio