[ebxml-cppa] reliable messaging comments

[Martin W Sachs <mwsachs@us.ibm.com>]

Following are significant technical comments on reliable messaging in V1.11
that should be discussed as soon as possible

Section 8.4.40, ReliableMessaging element

We need to state what delivery semantics are implied by the presence of the
ReliableMessaging element.  Is it onceAndOnlyOnce or does it depend on the
states of its child elements and the PersistDuration element?

Section 8.4.41, PersistDuration element

Since the PersistDuration has cardinality 0 or 1, we need tighter rules on
its use besides the rule that it must appear if MessageOrder is
"guaranteed".

PersistDuration applies to, and only to, reliable messaging.  Therefore, it
should be a child element of the ReliableMessaging element.

We need to state what happens to duplicate elimination if the
PersistDuration element is omitted.  Possibilities are:
   Duplicate elimination takes place but the value of PersistDuration is a
   local matter.
   There is no duplicate elimination and the delivery semantics become
   atLeastOnce, which is not really reliable messaging.

The short term answer to the above has to be consistent with ebMS 2.0.

Regards,
Marty

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Martin W. Sachs
IBM T. J. Watson Research Center
P. O. B. 704
Yorktown Hts, NY 10598
914-784-7287;  IBM tie line 863-7287
Notes address:  Martin W Sachs/Watson/IBM
Internet address:  mwsachs @ us.ibm.com
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