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XML Schema Part 0: http://www.w3.org/TR/xmlschema-0/
XML Schema Part 1: http://www.w3.org/TR/xmlschema-1/
XML Schema Part 2: http://www.w3.org/TR/xmlschema-2/
RELAX NG Specification: http://www.oasis-open.org/committees/relax-ng/spec-20011203.html
RELAX NG Tutorial: http://relaxng.org/tutorial-20011203.html
RELAX NG Tutorial: http://relaxng.org/tutorial-20011203.html
XSV (Validator for XML Schema): http://www.w3.org/2001/03/webdata/xsv
Jeni Tennison's Schema Pages: http://www.jenitennison.com/schema/index.html
XMLSCHEMA-DEV Mailing list: http://lists.w3.org/Archives/Public/xmlschema-dev/