[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XML Schema considered harmful?
Hi, > To my mind, the bigger issue to decide is how many schema langauges > the IETF want appearing in RFCs. Simply allowing both means that RFC > readers have to learn both. And since RELAX NG focusses on structure, > what will be used to express content based co-constraints? Perhaps it > would be better to be arguing for DSDL. As long as your application isn't highly time critical you can always embedd Schematron rules within a RELAX-NG schema. Sun's MSV [1] will support Schematron like rules in RELAX-NG schemas and I've just finished an RNG2Schtrn.xsl [2] XSLT stylesheet that will extract Schematron rules from a RELAX-NG schema and create a Schematron schema that can be used for validation. It works similar to the XSD2Schtrn.xsl [3] stylesheet that extracts Schematron rules from a W3C XML Schema with one difference: 1) Schematron rules in a RELAX-NG schema can appear anywhere between elements in the RELAX-NG namespace (in W3C XML Schema they have to be declared inside the xs:appinfo element) Like the XSD2Schtrn.xsl stylesheet the RNG2Schtrn.xsl stylesheet will also extract Schematron rules that are included in RELAX-NG modules from the main RNG schema by either <include> or <externalRef>. I'm currently modifying my previous article on how to embedd Schematron rules in W3C XML Schema to add a new section on how this is done in RELAX-NG and it will be available shortly. If you're interested in embedding Schematron rules in a RELAX-NG schema you can still have a look at the original article [4] because the technique used for both W3C XML Schema and RELAX-NG is exactly the same. Cheers, /Eddie [1] http://wwws.sun.com/software/xml/developers/schematronaddon/ [2] http://www.topologi.com/public/Schtrn_XSD/RNG2Schtrn.zip [3] http://www.topologi.com/public/Schtrn_XSD/XSD2Schtrn.zip [4] http://www.topologi.com/public/Schtrn_XSD/Paper.html
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