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Comparative Analysis of Six XML Schema Languages
Paper by Dongwon Lee and Wesley W. Chu comparing XML DTD, XML Schema, XDR, SOX, Schematron, and DSD.
www.cobase.cs.ucla.edu
XML Well-Formedness Checker and Validator
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.
www.cogsci.ed.ac.uk
Uses instance documents as a lightweight schema language; sample documents are marked up with the information needed to guide a validator.
examplotron.org
Specification of a framework for modular validation of XML documents.
www.topologi.com
integrity management of distributed XML data. Provides a validation rules language and processing engine that allows constraints beyond schema and DTD validation.
www.systemwire.com
A open source multi-format schema converter based on RELAX NG. Includes documentation and download.
www.thaiopensource.com
Automated data quality checking of XML content.
www.xmlprobe.com