[Dime] Support for Class AVP mandatory in session based apps?

[Anders Kristensen <andersk at cisco.com>]

The Class AVP defined in the base Diameter spec allows a server to pass 
a "cookie" to the client and receive it back in subsequent requests from 
the client to the server belonging to the same session.

However, a number of applications do not explicitly list the Class AVP 
in the definition of session-creating answers or in mid-session 
messages. This is true, for example, for the Credit-Control-Answer in 
RFC 4006 and for the AA-Answer in 3GPP TS 29.209 (IMS's Gq app). While 
the Class AVP is not explicitly listed the grammars of both these 
answers do include *[AVP] so at least according to the grammar it's OK 
to include the Class AVP.

My question is whether a client that does not honor the Class AVP in 
these cases can claim to be standards compliant. In my view it would be 
preferable if support for the Class AVP was required for all session 
based apps unless possibly if an application explicitly says otherwise 
(and not just in the grammar).

Thanks,
Anders

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