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RELAX NG Eric van der Vlist, O'Reilly & Associates, 2004
Practical RDF Shelley Powers, O'Reilly & Associates, 2003.
Learning XML Erik Ray, O'Reilly & Associates, 2003
On using RELAX NG for XHTML http://lists.w3.org/Archives/Public/www-svg/2003May/0069.html
Trang http://www.thaiopensource.com/relaxng/trang.html
RELAX NG generally http://relaxng.org
RELAX NG articles http://www.xml.com/search/index.ncsp?sp-q=RELAX+NG
Schematron http://www.ascc.net/xml/resource/schematron/schematron.html
DSDL activity http://dsdl.org
Examplotron http://examplotron.org
RDF http://planetrdf.com
This presentation http://simonstl.com/articles/sanity2/