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RE: Problem with resolution of Issue 221

From: Elliotte Rusty Harold <elharo@metalab.unc.edu>
Date: Tue, 3 Sep 2002 22:02:11 -0400
Message-Id: <p04330109b99b18060e23@[192.168.254.4]>
To: xml-dist-app@w3.org

At 6:25 PM -0400 9/3/02, noah_mendelsohn@us.ibm.com wrote:


>Let's say the server responds with a SOAP message that contains a
>mustUnderstand='true' header that changes the semantic of the response
>(I.e. changes it relative to the meaning without the header.)  For
>example, maybe it specifies that all currency is in Mexican Pesos (ah,
>remember that example Andrew?)  If the stylesheet doesn't pick up that
>essential fact, it might format numbers as French Francs or US Dollars.

Yes, but the same server is providing both the stylesheet and the 
SOAP response. Or at the very least it's choosing the appropriate 
stylesheet to go with the response. In essence, it's giving the 
client the code it needs to display the document. Here then the onus 
is one the server, which is a SOAP processor, to handle this 
accordingly and either provide a Peso stylesheet or a stylesheet that 
does check which currency is in use.

Will mistakes be made? Yes, just as they will be with allegedly SOAP 
aware clients. Experience shows the specs will not be implemented 
perfectly all the time, no matter how we arrange it, neither on the 
client side or the server side. I suppose it's probably somewhat more 
likely that the theoretical SOAP aware clients will handle 
mustUnderstand properly. However, I also think it will be easier to 
deploy some of this stuff if PIs are allowed. There are trade-offs 
either way, and no solution is perfect.

>   Similarly, if the response
>was a SOAP fault, would we expect that to include a stylesheet PI that
>would help the XForm processor to do the right thing?

Yes, we would.

>In short:  SOAP messages are intended to be processed by SOAP-conforming
>software agents.

Not always. Some processes that deal with them may not be SOAP 
processes. For instance, in writing about SOAP, I might well choose 
to use an XInclude or some other that loads up a SOAP response from a 
server and inserts it as an example into my book or slide. Not 
everyone uses data in the most common or the intended way, and 
they're not necessarily wrong for doing so if the processes they 
apply are useful to them.
-- 

+-----------------------+------------------------+-------------------+
| Elliotte Rusty Harold | elharo@metalab.unc.edu | Writer/Programmer |
+-----------------------+------------------------+-------------------+
|          XML in a  Nutshell, 2nd Edition (O'Reilly, 2002)          |
|              http://www.cafeconleche.org/books/xian2/              |
|  http://www.amazon.com/exec/obidos/ISBN%3D0596002920/cafeaulaitA/  |
+----------------------------------+---------------------------------+
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Received on Tuesday, 3 September 2002 22:10:49 GMT

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