  |
http://www.thaiopensource.com/relaxng/trang.html - http://www.thaiopensource.com/relaxng/trang.html
A open source multi-format schema converter based on RELAX NG. Includes documentation and download. |
  |
Examplotron - http://examplotron.org/
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 - http://www.cobase.cs.ucla.edu/tech-docs/dongwon/ucla-200008.html
Paper by Dongwon Lee and Wesley W. Chu comparing XML DTD, XML Schema, XDR, SOX, Schematron, and DSD. |
  |
Schemachine - http://www.topologi.com/public/Schemachine.pdf
Specification of a framework for modular validation of XML documents. |
  |
Systemwire xlinkit - http://www.systemwire.com/solutions/technology_overview.html
integrity management of distributed XML data. Provides a validation rules language and processing engine that allows constraints beyond schema and DTD validation. |