Sites about the various competing ways to validate XML documents for correctness according to a schema definition, including: DTDs, XML Schema, and rule-based approaches.
Paper by Dongwon Lee and Wesley W. Chu comparing XML DTD, XML Schema, XDR, SOX, Schematron, and DSD.
Uses instance documents as a lightweight schema language; sample documents are marked up with the information needed to guide a validator.
Specification of a framework for modular validation of XML documents.
A open source multi-format schema converter based on RELAX NG. Includes documentation and download.
Checks an XML document (specified by URL) for well-formedness and optionally DTD-based validity and namespace correctness. Outputs canonical XML. Runs over the web and can be downloaded.
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