[xacml] Standardized PRP request format?

Hi,  I was wondering whether the policy request interface between the PDP and the PDP would not benefit from a standardized  interface. Looking at the data flow model on p. 15 of the v13  draft, I noticed that the return value from the PRP has a  standard format (viz. XACML policyStatement) but the request  hasn't.
I would have thought that interoperability using this interface  would probably be one of the main selling points of XACML  for PEP/PDP vendors ("mechanism vendors") and PRP/PAP  vendors ("policy tool vendors").
I had a brief discussion about this issue with Don and  Konstantin the other day but would like to collect more  opinions from the list (now that I finally can post to it :-) Thanks, Carlisle, for sorting out the mailing-list problems)  Best regards, Gerald.

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Dr. Gerald Brose, Software Architect
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Xtradyne Technologies
http://www.xtradyne.com  Schoenhauser Allee 6-7,
Phone: +49-30-440 306-27 D-10119 Berlin, Germany
Fax  : +49-30-440 306-78