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Re: Issue 4 Proposed Resolution (was: why no doc type declarationand PIsin SOAP)

From: <Noah_Mendelsohn@lotus.com>
Date: Tue, 2 Oct 2001 18:12:18 -0400
To: francis@redrice.com
Cc: andrewl@microsoft.com, hutch@xampl.com, xml-dist-app@w3.org
Message-ID: <OFB4BA164C.BC9B3D6B-ON85256AD9.007A73EA@lotus.com>
Francis Norton writes:

>> But I'd like to suggest that we can satisfy both 
>> requirements more simply by standardizing on 
>> the XPath 1.0 data model.

Isn't that exactly the need that's met by the use of XML Infoset to model 
messages at a local node in the latest specification?  See [1].  I think 
it's fair to say that W3C is moving toward infoset as opposed to the XPath 
data model as the generic abstract model for XML...or more to the point, 
they will come together as necessary.  So, I think we've done what you're 
suggesting.  The Infoset does not currently provide a model for DTDs (or 
schemas);   though there is such an abstraction for schemas in the schemas 
spec, SOAP does not use it.

Still, as has been pointed out, a given transport binding either will or 
won't allow DTDs in the XML serialization on the wire.  I can assure you, 
having built implementations both ways, that requiring the receiver to 
parse and apply entity definitions from a DTD will cost you something in a 
high performance implementation.  So, as I've said to often now, I think 
we should not in general allow DTD's in abstract SOAP messages, and should 
not use them in the wire formats for any transport bindings offered by the 
protocol workgroup itself.

This is an important topic, but I'm beginning to feel that we've gotten 
the essential points on the table for the workgroup to consider.  Should 
we wind down the email thread for now?

[1] http://www.w3.org/TR/2001/WD-soap12-part1-20011002/#soapenv

Noah Mendelsohn                                    Voice: 1-617-693-4036
Lotus Development Corp.                            Fax: 1-617-693-8676
One Rogers Street
Cambridge, MA 02142
Received on Tuesday, 2 October 2001 18:21:02 UTC

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