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Re: ACTION NW xmlChunk-44: Chunk of XML - Canonicalization and equality

From: <noah_mendelsohn@us.ibm.com>
Date: Tue, 29 Jun 2004 14:25:29 -0400
To: Norman Walsh <Norman.Walsh@Sun.COM>
Cc: www-tag@w3.org
Message-ID: <OF35888BB9.748A314F-ON85256EC2.0063451A@lotus.com>

Norm:  I'm curious about a few things.  Have you given any thought to the 
XML 1.0/XML 1.1 issue as it relates to your writeup.  As best I can tell, 
Infoset has no formal notion of the distinction, but implies that if a 
(non-synthetic) Infoset resulting from the parse of an actual serialized 
document results in a [version] property on the document information item, 
then that version applies in some sense to all descendants.  There is no 
conformance rule relating to the possibility that, for example, element 
names would in fact be consistent with the apparent version.  I can also 
see no indication that versions must be applied consistently in the case 
that a synthetic infoset is constructed.

I'm not particularly advocating one answer or another, but I think it 
would be useful to verify that 

a) Two document info items that differ only in [version] are or or not 
b) Is it even meaningful to compare two elements taken out of the context 
of their enclosing documents.  I believe it's fair to say that the Infoset 
rec is silent as to whether such things can exist or be dealt with in 
isolation;  I note that the schema recommendation currently claims to 
validate element info items and doesn't mention document info items one 
way or the other.  We are in fact debating whether it is sensible to imply 
that one can invariably walk up to some document info item ancestor to 
determine an XML version.  Anyway, in whatever way it is meaningful to 
compare element info items "out of context", we need to decide whether XML 
versions enter into the equation, and how that relates to our story at the 
document info item level.

Thank you very much.

Noah Mendelsohn 
IBM Corporation
One Rogers Street
Cambridge, MA 02142
Received on Tuesday, 29 June 2004 14:29:23 UTC

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