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RE: Relax NG, Thoughts, etc.

jaxp relaxng
> There are 5 standard Validation Languages:
> 1. DTD
> 2. XML Schemas
> 3. RelaxNG
> 4. Schematron
> But the following technologies have been created to only 
> utilize one of them
> (XML Schemas):
> a. XSLT 
> b. XPath 
> c. XQuery 
> d. SOAP
> e. WSDL

Although all of 1-5 might do validation, only one of them does data typing,
and XSLT/XPath/XQuery are using XML Schema as a data typing language, not
primarily as a validation language.

However, integrating output validation into XSLT is, I think, the biggest
"quick win" that schema integration brings, and there's no technical reason
why this part of the story shouldn't work equally well with other schema
languages. You won't see anything standardised in this round, but it
wouldn't be surprising to see vendor extensions in this area. In principle
it should be straightforward for an XSLT processor (even a 1.0 processor) to
support result tree validation using any class that implements the JAXP 1.3
ValidatorHandler interface. 

Michael Kay


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