Schematron, You Are On - paper, that is

At long last, the ISO Schematron standard spec is available as printed hardcopy from the ISO.

Not only that, it is available from ANSI too! Most americans will probably get it from ANSI, since their price is in dollars - not swiss francs. Not to mention most americans are better at reading English than French and do not live particularly close to central Europe.

O'Reilly XML Blog:

The paper and online versions of the ISO Schematron standard are now available from ISO for CHF120 and from ANSI for US$98.

This is one of the simplest ways to validate an XML document that there is. It is based on rules, not grammar. So it works better for XML document formats that are, as should be obvious, specified according to rules - not a grammar per se.

Combined with the RELAX NG schema format, which is a grammar based schema language (and a simple one at that) - Schematron rules can provide a lot of flexibility in determining if (or why not!) an XML document is valid.

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