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RE: Restrictions on existence of attributes?

• To: xml-dev@l...
• Subject: RE: Restrictions on existence of attributes?
• From: Eric van der Vlist <vdv@d...>
• Date: Thu, 06 Jul 2006 10:25:40 +0200
• In-reply-to: <008701c6a0d3$3652af90$6401a8c0@turtle>
• Organization: Dyomedea (http://dyomedea.com)
• References: <008701c6a0d3$3652af90$6401a8c0@turtle>

Le jeudi 06 juillet 2006 à 09:07 +0100, Michael Kay a écrit :
> > a toolmaker could easily make a system that checks whether one 
> > RELAX NG schema is a restricted or xsd-style extension of 
> > another. 
> 
> I disagree. Just because month has the value-set 1..12 and percentage has
> the value-set 1..100 does not mean that month is a subtype of percentage.
> Subtyping is a semantic relationship, not merely a syntactic one.

Yes, but...

I agree that subtyping is a semantic relationship and that's why I think
that it would be appropriate to use annotations to express this notion
in RELAX NG.

There are cases where things are already clear enough in a RELAX NG
schema to detect these relations (typically in my examples corresponding
to extension and substitution groups).

And it would also be useful to be able to check if a schema is a
restriction or an extension of another one. This is a different concept
which is purely about validation but tools to check this would be very
useful in a number of situations.

Eric

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Eric van der Vlist       http://xmlfr.org            http://dyomedea.com
(ISO) RELAX NG   ISBN:0-596-00421-4 http://oreilly.com/catalog/relax
(W3C) XML Schema ISBN:0-596-00252-1 http://oreilly.com/catalog/xmlschema
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    • From: "Michael Kay" <mike@s...>

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