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In the article the option of using XSLT to express rules based constraints on structure of schemas, with xPaths to compliment the constraints expressed in the metaschema. Schematron [1] provides a simpler strucure in which to express such xPath constraints. The schematron rules can be embedded into the metaschema, allowing both approaches to be combined.
[1] http://www.ascc.net/xml/resource/schematron/schematron.html
[2] [3] http://www.topologi.com/public/Schtrn_XSD/Paper.html
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