[ebxml-dev] SequenceNumber?

[Jeong Ahn Lee <jeongahn2001@yahoo.com>]

Hi all, 

in ebXML V1.0 the SequenceNumber was mandatory for
reliable messaging.

but in V2.0 it says, When the MessageOrder element is
present, 
DuplicateElimination MUST also be present and
SyncReply MUST NOT be present.

but for reliable messaging, we use HTTP so that we can
get the respone
immediately, this is synchronize messaging, to achieve
this we use the
SyncReply element indicating i expect the response in
the same connection.

but SequenceNumber is also very much important for
reliable messaging if i 
am correct. why in the specification they have made it
like, when 
SequenceNumber element is present SyncReply MUST NOT
be present.

any light on this.
Jeong

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