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Re: canonical xml

• To: Rick Jelliffe <ricko@a...>
• Subject: Re: canonical xml
• From: Eric van der Vlist <vdv@d...>
• Date: 21 Nov 2002 13:22:46 +0100
• Cc: xml-dev@l...
• In-reply-to: <022901c29126$d5e8e530$4bc8a8c0@A...>
• References: <5BA3B65DED5F18459100E94091271F93FAD1DD@bby1exm01> <022901c29126$d5e8e530$4bc8a8c0@A...>

On Thu, 2002-11-21 at 07:25, Rick Jelliffe wrote:
>  From: "Jon Steeves" <Jon_Steeves@p...>
>  
> > Doesn't the existence of a special version of canonical xml mean that there is no 
> > canonical xml?
> 
> No, it means there are multiple canons (lists) for different purposes.  This is another
> capitalization issue: Canonical XML is not the only canonical XML, just as 
> XML Schemas are not the only XML schemas, and the XML Infoset is not the only
> XML infoset. 

Sure, but that's probably stronger than this in the case of
canonicalization: there cannot be a single canonical XML because
canonicalization is application dependent in a deep and complex
manner...

For instance, if you take W3C XML Schema snippets on which I came across
recently,

<xs:all>
 <xs:element ref="foo"/>
 <xs:element ref="bar"/>
</xs:all>

and

<xs:all>
 <xs:element ref="bar"/>
 <xs:element ref="foo"/>
</xs:all>

are equivalent while

<xs:sequence>
 <xs:element ref="foo"/>
 <xs:element ref="bar"/>
</xs:sequence>

and

<xs:sequence>
 <xs:element ref="bar"/>
 <xs:element ref="foo"/>
</xs:sequence>

are not and a canonicalization process for W3C XML Schema should
probably take this into account!

Elaborating around this no later than this morning on XMLfr, I came to
the conclusion that a formal language to describe canonicalization
processes (probably based on XSLT like Schematron) would be most
useful...

Any volunteers to start?

Eric

-- 
See you in Baltimore.
                                    http://www.xmlconference.org/xmlusa/
------------------------------------------------------------------------
Eric van der Vlist       http://xmlfr.org            http://dyomedea.com
(W3C) XML Schema ISBN:0-596-00252-1 http://oreilly.com/catalog/xmlschema
------------------------------------------------------------------------

• References:
  • canonical xml
    • From: Jon Steeves <Jon_Steeves@p...>
  • Re: canonical xml
    • From: "Rick Jelliffe" <ricko@a...>

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