[xsl] Comparison of XSD, NVDL, Schematron and RelaxNG ?

Subject: [xsl] Comparison of XSD, NVDL, Schematron and RelaxNG ?
From: "Ben Stover" <bxstover@xxxxxxxxxxx>
Date: Sun, 27 Apr 2008 08:14:16 +0200
Does someone here know a good comparsion of the various schema laguages such as

- Standard XSD
- RelaxNG
- NVDL
- Schematron

Assume I don't want to use standard XSD schemas: what is the "best" remaining schema?

How much are they supported by developers/community?

For which exists the best and most tools?

Thank you
Ben

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