Noah,


On Thursday, May 8, 2003, at 11:02 US/Eastern,
noah_mendelsohn@us.ibm.com wrote:


<excerpt>

John Kemp asks:


<excerpt><excerpt>May I ask why you would preclude use of 1.1
envelopes?

</excerpt></excerpt>

I think there are two legitimate answers to this.  The somewhat
fascecious 

and negative answer would be:


a) For the same reason you don't allow an image/gif to contain an 

image/jpeg stream, even if that's what the server prefers to send
back. 

You COULD define image/gif to allow both, but it would reduce the
utility 

of the media type as a negotation and dispatch mechanism.  For the
same 

reason, the application/soap+xml (which might better be named 

application/soap12+xml) is defined to rather strictly accept one
format.

</excerpt>

So you consider different versions of SOAP to represent different
formats? I'm afraid that I don't really see the analogy - to me, the
SOAP case is more like having support for different versions of JPEG
(or GIF). Isn't the content always an XML-serialized SOAP envelope,
regardless of the version of SOAP used? And, from reading the [SOAP12]
specs. it looked to me as if envelope version negotiation was actually
carried out according to the rules specified in [SOAP121] Section 2.8.  


However, if you really do mean application/soap12+xml (and the group
considers that the content of a 1.1 envelope is as different from a
1.2 envelope as the content of a GIF file is from a JPEG) then I think
the media type should say that specifically (soap12+xml) to avoid any
confusion that the type could be used for other versions of SOAP.


<excerpt>or the more liberal:


b) The media type isn't going to be completely useful in negotiating 

interop at the soap level. The media type definition is changed to
include 

both forms of a soap request, and you have to look at the root qname
to 

see which you've got.

</excerpt>

I believe that this is basically what's specified in [SOAP121] Section
2.9 SOAP Versioning Model.


- JohnK

________________________________

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