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RE: An analysis of mustUnderstand and related issues

From: <Noah_Mendelsohn@lotus.com>
Date: Wed, 16 May 2001 17:45:11 -0400
To: "Henrik Frystyk Nielsen" <henrikn@microsoft.com>
Cc: "Doug Davis" <dug@us.ibm.com>, xml-dist-app@w3.org
Message-ID: <OF27FE732A.999D414A-ON85256A4E.00767453@lotus.com>
Henrik writes:

>> One of the points that Noah brings up 
>> is if the extensibility mechanism
>> indeed is good enough and that is a valid concern.

On the call just now, Glen brought up what I think is the area requiring 
greatest attention:  if several headers for the same header all indicate 
mustUnderstand, can we say anything about the order processed?  In SOAP 
1.1, I think the answer is "no".  Henrik suggests (a) that lexical order 
be significant -- I think that's a change to SOAP 1.1, though possibly a 
good idea (b) that rollback be required if later processing fails--I'm not 
sure this is practical, but we should consider it.  Also:  I don't think 
anything suggests that different actor URI's are necessarily different 
processors---so multiple header blocks addressed to what appear to be 
different actors might, in fact, interleave.  Consider "next" as just one 
example.  I'm not sure a lexical order dependency handles these cases 
gracefully.

------------------------------------------------------------------------
Noah Mendelsohn                                    Voice: 1-617-693-4036
Lotus Development Corp.                            Fax: 1-617-693-8676
One Rogers Street
Cambridge, MA 02142
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Received on Wednesday, 16 May 2001 17:48:55 GMT

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