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Subject: Re: [ebxml-msg] Reliable Messaging question
David,
Almost every error may be transient. Further, our documentation
gives no "out" for the sending MSH other than exceeding the Retries parameter
or receiving an appropriate Acknowledgment. Adding the ErrorList
element to that list of outs would be very different from 1.0 and would
involve multiple changes to our document. That's in spite of the
a receiving MSH already being able to send ErrorList and Acknowledgment
together.
125 was an editorial issue because the other parts of our specification
were clear what could stop retries. The section referenced in issue
125 muddied things. Let's not turn this into a new technical issue.
thanx,
doug
David Fischer wrote:
Why
would an MSH continue sending retries after receiving an ErrorList for
that MessageId? Section 6.5.7 indicates that when a message cannot
be delivered then a DFN must be returned. You are right though, it
doesn't actually say not to send any more retries. I'm
a little confused... If an Acknowledgment is present with an ErrorList,
does that mean the MSH does or doesn't send a DFN to the application?
I suppose if the message got far enough so that the receiving MSH could
actually generate an Acknowledgment then that would constitute delivery
for the purposes of RM? I think this
would be OK -- send an ErrorList and an Acknowledgment together.I'm
still not clear why the sending MSH would continue to send retries if it
got an ErrorList (containing the appropriate RefToMessageId) from the receiving
MSH but without an Acknowledgment?Regards,David
FischerDrummond
Group.
Arvola,
I believe this is captured in issue 125. In David's response [1],
he indicated an ErrorList could end retries but that interpretation is
not borne out by our current documentation and seems incorrect. I
would suggest we stick with the current retry semantics and end retries
only upon receipt of an Acknowledgment or exhaustion of allowable retries.
If a MSH receiving a message in error chooses to respond with an Acknowledgment
bundled together with an ErrorList, fine.
I also agree this option (combining Acknowledgment with ErrorList) isn't
well described. Improving that description was the intent of issue
125.
thanx,
doug
[1] http://lists.oasis-open.org/archives/ebxml-msg/200202/msg00006.html
(specifically, the XML file attached and unhelpfully inlined by the OASIS
site)
Arvola Chan wrote:
Section 7.5.2 in Draft version
2.0 describes Receiving Message Behavior under the ebXML Reliable Messaging
Protocol. It does not mention anything about error handling. Suppose
the received message is erroneous (e.g., some elements in the message are
inconsistent with the CPA), the receiver is obligated to return an Error
message. It is not clear to me if an Acknowledgment MUST also be included
in the Error message. Does the Error message serve
as an implicit Acknowledgement? Will the sender keep retrying until it
gets back an Acknowledgment (i.e., as long as the number of allowable retries
have not been exhausted)? Thanks,-Arvola
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