TAG requests help with examples of WS-Addressing

The TAG is trying to learn more about Web Services Addressing and its 
likely uses.  To further our investigations, TAG member Henry Thompson set 
out to create a representative example of Endpoint Reference use, based 
primarily on what he could learn from publicly available sources.  Note 
that Henry claims no deep expertise in WSA, and indeed is trying to learn 
by doing.  Henry's first pass at an example is at [1] (advertised in email 
at [2]).  In part because it contained both samples and a toolkit, Henry 
chose to use the Apache WSRF toolkit [3] as the basis for his work. 

The TAG would very much appreciate guidance as to whether this is an 
appropriate first example from which to learn, and if not, where we might 
look to find something more representative.  Among the specific questions 
and concerns that have arisen are:

* If we want to understand typical uses of EPRs, are we doing the right 
thing to start with WSRF-based examples or are there others we should 
consider first?

* Given that the example is WSRF-based, there is some confusion as to 
where the EPR would have come from, and the degree to which the EPR would 
in practice be opaque to the client.  In other discussions it has been 
suggested that EPRs are typically returned from a service provider and 
are, except insofar as the SOAP binding requires them to be re-expressed 
as headers for transmission, opaque to the client.

* Is it typical to have an operation such as sq:TradePriceRequest, as in 
Henry's example, or would it be more common to have a more generic 
GET-like operation such as GetResourceProperty [4]?

* The likely use of WSDL with EPRs is still somewhat unclear to us. 
Henry's example does provide some WSDL, but it's not entirely clear how 
its use relates to Web Services addressing.

The TAG is holding a F2F meeting on Monday and Tuesday Dec. 5 and 6.  For 
the moment, it will be more useful to have early informal input than to 
have a later formal response from the Web Services Addressing Workgroup. 
Any guidance that you can provide us would be much appreciated.

Thank you.

Noah Mendelsohn
- for the W3C Technical Architecture Group

[1] 
http://lists.w3.org/Archives/Public/www-tag/2005Nov/att-0008/eprExample.html
[2] http://lists.w3.org/Archives/Public/www-tag/2005Nov/0008.html
[3] http://ws.apache.org/wsrf/
[4] 
http://docs.oasis-open.org/wsrf/2004/11/wsrf-WS-ResourceProperties-1.2-draft-05.pdf

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Noah Mendelsohn 
IBM Corporation
One Rogers Street
Cambridge, MA 02142
1-617-693-4036
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Received on Tuesday, 29 November 2005 19:22:35 UTC