other XML vocabularies http://xml.coverpages.org/userInterfaceXML.html http://xml.coverpages.org/userInterfaceXML.html http://xml.coverpages.org/userInterfaceXML.html XForms Numerous others http://xml.coverpages.org/userInterfaceXML.html(...) http://xml.coverpages.org/userInterfaceXML.html