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I have some feedback to the updated spec as follows: [Issue63, 64] As I made comments on the teleconference, the proposed sentence doesn't solve the problem. Because it doesn't say when SequenceNumber is required. My proposed sentence for Line#1070-1074 is: -------------------------------------------- The SequenceNumber element MUST appear when deliverySemantics has a value of OnceAndOnlyOnce and messageOrderSemantics has a value of Guaranteed. Otherwise, SequenceNumber MAY NOT appear. If deliverySemantics doesn't have a value of OnceAndOnlyOnce, SequenceNumber MUST NOT appear. If this criterion is not met, an error MUST be reported to the From Party MSH with an errorCode of Inconsistent and a severity of Error. ------------------------------------------- This explanation is based on the original sentence, and made clarification as we concluded. The point here is: - SequenceNumber MUST appear when: deliverySemantics="OnceAndOnlyOnce" and messageOrderSemantics="Guaranteed" - Otherwise it is NOT REQUIRED. (And spec doesn't preclude to put sequenceNumber, when deliverySemantics="OnceAndOnlyOnce") - SequenceNumber MUST NOT appear when deliverySemantincs="BestEffort" This was discussed already, and came to a conclusion. See : <http://lists.ebxml.org/archives/ebxml-transport/200103/msg00104.html>. Iwasa