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I
haven't dug deeply into this abstract schema model. But a cursory look looks
like it is just an object model for XML Schema. It's does not look very generic
to me. The W3C could learn a lot from the work that has happened in the RELAX
and RELAX NG communities. Also, Schematron is not grammar-based, so you could
not just do a straightforward mapping of an XML Schema grammar into Schematron.
You would have to infer XPath patterns from the structure in the grammar since
Schematron is pattern-based.
A far
more interesting abstract schema model is in Sun's Multi-Schema Validator
library. Check out http://www.sun.com/xml.
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