DTDs
(3)
Historical Schema Languages
(4)
RELAX NG
(4)
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Schematron
(4)
XML Schema
(36)
Examplotron
Uses instance documents as a lightweight schema language; sample documents are marked up with the information needed to guide a validator.
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.
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.
Systemwire xlinkit
integrity management of distributed XML data. Provides a validation rules language and processing engine that allows constraints beyond schema and DTD validation.
Trang
A open source multi-format schema converter based on RELAX NG. Includes documentation and download.
Schemachine
Specification of a framework for modular validation of XML documents.
XMLProbe
Automated data quality checking of XML content.
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