XML Specification (1.0): http://www.w3.org/TR/2004/REC-xml-20040204/
Namespaces in XML (1.0): http://www.w3.org/TR/REC-xml-names/
XML Specification (1.1): http://www.w3.org/TR/2004/REC-xml11-20040204/
Namespaces in XML (1.1): http://www.w3.org/TR/xml-names11/
XML.org: http://www.xml.org/
Cover Pages: http://xml.coverpages.org/
XML-DEV Mailing list: http://www.xml.org/xml/xmldev.shtml