[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: Relax NG, Thoughts, etc.

relax ng jaxp 1.3
Michael Kay wrote:

>>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.
Daniela  already answered to that.

>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
There are actually many reasons why validation should not work equally 
well with other schema languages.

>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. 
Granted, dynamic validation (=at runtime) is always possible, but it is 
certainly not a big help. Errors are discovered after having gone to 
production, doesn't sound good to me.

But one should not forget to mention that static typing (using the 
validation language to determine at compile time) is certainly more 
useful, and simply not possible with some of the mentioned approaches.

I am sure you will not try to add exact static typing based on Relax NG 
for XSLT in the next version of Saxon? There are papers that analyze 
this for subsets of XSLT, but doing it exactly, for the full language, 
is - as far as I remember - undecidable.


Burak Emir



Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
First Name
Last Name
Subscribe in XML format
RSS 2.0
Atom 0.3

Stylus Studio has published XML-DEV in RSS and ATOM formats, enabling users to easily subcribe to the list from their preferred news reader application.

Stylus Studio Sponsored Links are added links designed to provide related and additional information to the visitors of this website. they were not included by the author in the initial post. To view the content without the Sponsor Links please click here.

Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.