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LC Comment: Uniqueness of [message id]

From: David Hull <dmh@tibco.com>
Date: Thu, 05 May 2005 15:35:09 -0400
To: public-ws-addressing-comments@w3.org
Message-id: <427A756D.7070509@tibco.com>

Section 3 of the core states, in the description of the [message id] 
property that the [message id] is

"An absolute IRI that uniquely identifies this message in time and 
space. No two messages with a distinct application intent may share a 
[message id] property."

This is neither enforceable nor necessary.  The only functional 
requirement for message IDs is that they be sufficient to correlate 
messages.  Exactly what further requirements this imposes depend on the 
deployment.  In particular, if the reply endpoint is anonymous and the 
binding is SOAP/HTTP, there is no need for a message ID at all.

If there is no specific reason for this restriction, other than it being 
a good idea in many circumstances, then the requirement should be 
removed or at least softened to something like "Messages with distinct 
application intent SHOULD NOT have identical [message id] properties."

If there is a compelling reason for this restriction, then it should be 
strengthened to RFC 2119, as for example "Messages with distinct 
application intent MUST NOT have identical [message id] properties.", 
and the reason should be made clear.
Received on Thursday, 5 May 2005 19:35:18 GMT

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