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Subject: [ebxml-cppa] CPAId; negotiation


The To and From parties must each understand what value of CPAId will be
understood by the From party.  As defined in the MS specification, the
CPAId is a single value that must be understood by both parties.

I suggest that:

   The CPAId must be an item of negotiation since the two parties must
   agree on a value that both understand.
   At least for convenience, we should add to the top-level element of the
   CPA a child element or an attribute that will be filled with the CPAId.

Please note that the CPAId as sent in the message header is independent of
any identifier metadata associated with storing a CPA or CPA template in a
registry.

The CPAId element is not needed in the CPP.  However for convenience in the
CPA composition process, it might be helpful to have a CPAId element or
attribute in the CPP with a dummy value.

There was previously (Vienna or earlier) discussion about the need for a
CPP identifier in the CPP.  At that time it was (I think) agreed that a CPP
Id is an item of registry metadata and can only be assigned when the CPP is
placed in the registry. Since the CPP may be signed by the creater, the CPP
Id cannot be placed in the CPP  after it is signed.  Therefore, there is no
CPPId element in the CPP.

Regards,
Marty



*************************************************************************************

Martin W. Sachs
IBM T. J. Watson Research Center
P. O. B. 704
Yorktown Hts, NY 10598
914-784-7287;  IBM tie line 863-7287
Notes address:  Martin W Sachs/Watson/IBM
Internet address:  mwsachs @ us.ibm.com
*************************************************************************************



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