xml-dev - Re: RELAX to ISO

[rohit srivastava <srivasrmd@hotmail.com>]

Rick,

Do you think that the co-occurence constraints that schematron offers, will 
find their way into Schema? I found the co-occurence constraints that 
Schematron offeres, to be extremely useful, and it would be nice if the w3c 
adopted them in their Schema recommendation(when they release it).

Thanks,

Rohit Srivastava.


>From: Rick JELLIFFE <ricko@geotempo.com>
>To: xml-dev@lists.xml.org
>Subject: RELAX to ISO
>Date: Wed, 11 Oct 2000 22:02:44 +0800
>
>
>I was pleased to see the xmlhack story that RELAX is submitted for ISO
>fast-tracking to become a technical report.
>
>Congratulations to Murata-san and the others involved.
>
>I strongly believe that, because every schema language is made by
>weighing tradeoffs and with particular uses and design philosphies in
>mind, there is substantial benefit to the community in having different
>schema languages available.  The feature that one markup language omits
>may be the one you need sometime.  Which is not to deny the
>network-effect benefits of standardizing on particular schema languages.
>
>I think RELAX's strength is in content model issues and evolvability,
>while XML Schema's strength is in fine-grained datatyping, identity
>constraints and wildcarding.  So RELAX may be most useful for idiomatic
>human-oriented markup languages, which XML Schemas could be more useful
>for completely specifying data interchange formats.  (I am sure others
>will have legitimate views that are different. I am very interested in
>hearing other
>opinions on this.)
>
>People who are intimidated by XML Schemas (or, at least, by the material
>currently available to explain XML Schemas) may find RELAX more
>approachable.  For example, you could convert your existing DTD to RELAX
>to gain simple datatype validation, add Schematron schemas for more
>co-occurrence constraints, and then plan to convert from RELAX to XML
>Schemas when you become comfortable that XML Schemas is worth it.
>
>At this stage in the game, don't trust: try :-)
>
>
>Rick Jelliffe
>
>Developer, Schematron schema language;
>Member, W3C XML Schema WG (not in that capacity);

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