title: XACML JSON Mandatory categories in request
body: <p>I have a doubt with respect to the 4 categories of the <a href="http://docs.oasis-open.org/xacml/xacml-json-http/v1.0/xacml-json-http-v1.0.html" rel="nofollow">JSON Profile of XACML 3.0</a>.</p>
  
  <p>When I send a request in JSON from the PEP to the PDP, does the PEP always need to send AccessSubject, Resource, Action and Enviroment to the PDP or can the PEP send any category in the JSON request?</p>
  
  <p>This is the <a href="http://docs.oasis-open.org/xacml/xacml-json-http/v1.0/cs01/xacml-json-http-v1.0-cs01.html#_Toc406773642" rel="nofollow" title="diagram">diagram JSON request</a>.</p>