[OASIS Issue Tracker] Created: (EBXMLMSG-21) @mpc attribute on UserMessage needs editorial fix and clarification

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

@mpc attribute on UserMessage  needs editorial fix and clarification
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                 Key: EBXMLMSG-21
                 URL: http://tools.oasis-open.org/issues/browse/EBXMLMSG-21
             Project: OASIS ebXML Messaging Services TC
          Issue Type: Bug
          Components: AS4 Profile, Core Spec
            Reporter: Dale Moberg
            Priority: Minor


ebMS 3 Core Spec section 5.2.2 has a section on the @mpc attribute of eb:Messaging/eb:UserMessage. 

eb:Messaging/eb:UserMessage/@mpc: This OPTIONAL attribute contains a URI that
identifies the Message Partition Channel to which the message is assigned. The absence of this
element indicates the use of the default MPC. When the message is pulled, the value of this
attribute MUST indicate the MPC requested in the PullRequest message.

What is meant is conjectured to be that:

Unless the UserMessage is in response to a Pull request, the attribute is not used. When the UserMessage is in response
to a PullRequest and the @mpc attribute is absent, then the message reflects the use of the default MPC. But when the PullRequest
signal used a specific value for the MPC, then the UserMessage must have the @mpc attribute, and the value of that attribute must equal 
the MPC URI value that was requested in the PullRequest signal. 

The remark about "OPTIONAL" should be deleted as it is only a schema technicality, and is partly responsible for some confusion. 
The confusion is interpreting that the @mpc attribute can be omitted when the PullRequest has used a specific value in its @mpc attribute.



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