Discovered Pages
[Discover] schematron http://www.schematron.com/overview.html
(xml schematron schema xslt) 
[Discover] SourceForge.net: NMatrix http://sourceforge.net/projects/dotnetopensrc/ (.net xml schematron)
[Discover] darcusblog " Blog Archive " RELAX NG, XSD, Schematron http://netapps.muohio.edu/blogs/darcusb/darcusb/archives/2006/08/03/relax-ng-xsd-schematron (relaxng blogs schema xml)
[Discover] XMLMate :: XML/DTD/XSD/RNG/Schematron/XInclude/XPath Plug-In for TextMate http://www.ditchnet.org/xmlmate/ (xml textmate validation opensource)
[Discover] Schematron for checksum validation http://www.xmlplease.com/checksum (upc xslt checksum xml)