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implementation issue from Gary: . Currently the type field is optional . However, if the associated channel type has identity information, then without the message type, it is not possible to determine how the message will be correlated with the channel instance and choreography session . Possibly we could add a rule that indicates that the type must be specified if the channel type has identity details, as these details would only be added when intending to execute/monitor choreo, instead of just as a description
proposal at: http://lists.w3.org/Archives/Public/public-ws-chor/2006Jun/0006.html the text needs to be added after paragraph that begins "Within the exchange element, the OPTIONAL attributes ..." Proposal accepted at 18th jult 2006 meeting.