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Re: XML Schemas: Best Practices
- From: "Roger L. Costello" <email@example.com>
- To: firstname.lastname@example.org
- Date: Tue, 06 Mar 2001 13:07:30 -0500
I have summarized our discussions on the issue:
What is Best Practice of checking instance documents for constraints
that are not expressible by XML Schemas?
The summary may be found at:
All comments on the summary write-up are welcome.
Special thanks to Eddie Robertsson for putting together a complete demo
showing how to extend XML Schemas by incorporating Schematron directives
into XML Schema <appinfo> elements.
Although our discussions have been summarized, I feel that this issue is
far from being resolved. I don't feel like we have come up with a Best
Practice for this issue. I am not comfortable with any of the options.
Below is an editorial comment that I inserted at the bottom of the
issue's online summary. Any thoughts on this?
XML Schemas - Strive to be All Powerful?
As XML Schemas completes version 1 and begins work on version 2, the
question comes to mind: "should XML Schemas strive in the next version
to be all powerful?" Programming languages seem to have that goal - to
enable a programmer to express any problem using the language. Perhaps
the goal of version 2 of XML Schemas should be to provide enough
flexibility that any constraint may be expressed.
Alternatively, perhaps XML Schemas should just provide a core set of
constraint expressing mechanisms (as it does today), and let the
marketplace create a technology (technologies?) to supplement XML
Schemas. Then version 2 of XML Schemas would have few changes from