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   Re: [xml-dev] canonicalization

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At 12:55 PM -0500 3/3/02, Simon St.Laurent wrote:

>The crux of the issue seems to rest on whether XInclude's role as "a
>generic mechanism for merging XML documents (as represented by their
>information sets) for use by applications that need such a facility"
>affects "logical equivalence".

I think it most clearly does affect logical equivalence, especially 
after the latest XInclude working draft. Now that fallback elements 
can stand in for missing resources, and provide very different 
content, the actual content of a post-include document may vary 
depending on whether somebody's dropped a backhoe through various T-1 
lines connecting different parts of the Internet, and which parts of 
the Internet are relatively disconnected at which times. In such a 
world, XInclude resolution makes no sense as part of canonicalization.

A document that includes a list of links and fallback content is 
simply not logically the same as a document in which all the links 
have been replaced by their remote resources. It's the difference 
between a phone book and all the people listed in the phonebook. They 
are related, but they are not the same thing.

| Elliotte Rusty Harold | elharo@metalab.unc.edu | Writer/Programmer |
|          The XML Bible, 2nd Edition (Hungry Minds, 2001)           |
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