http://axkit.org
http://c2.com/cgi/wiki?ExtremeProgrammingCorePractices
http://msdn.microsoft.com
http://tidy. sourceforge .net/
http://www.servletsuite.com/servlets/xmlflt.htm
http://www.w3.org/TR/xhtml1/
http://xml.apache.org/cocoon
http://xsltunit.org