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RE: Canonicalizer that uses XML Schemas (rather than DTDs)?

  • To: <xml-dev@l...>
  • Subject: RE: Canonicalizer that uses XML Schemas (rather than DTDs)?
  • From: "Roger L. Costello" <costello@m...>
  • Date: Wed, 24 Nov 2004 13:38:53 -0500
  • In-reply-to: <41A288A9.7020104@m...>
  • Thread-index: AcTQ9rrvfzgFVsoOTTWy/d4NbE/StABTw5EQ

xml canonicalizer
Elliotte Rusty Harold wrote:

>> Why would it matter that a canonicalizer tool utilize an
>> XML Schema rather than a DTD?  Where would it make a difference?

>Such a canonicalizer would be nonconformant to the XML canonicalization 
>specification. 

Is it not time to update the XML canonicalization specification?  When
everyone was using DTDs then canonicalization of just {XML, DTD} pairs made
sense.  But now that many people are using XML Schemas it seems to me that
canonicalization needs to be upgraded to support {XML, XML-Schema} pairs.

Better yet, the canonicalization specification should be upgraded to handle
all 5 Validation Languages:

1. DTD
2. XML Schemas
3. RelaxNG
4. Schematron
5. OASIS CAM

That is, the canonical form of {XML, VL) should be the same (where VL = any
of the 5 Validation Languages listed above):

   {XML, VL} --------------> Canonical XML
               canonicalizer


Comments?  /Roger




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