XML Information Set: W3C Recommendation, XML, Namespace, Well Formed Document

Valid XML Document: XML, W3C, Well Formed Document, Document Type Definition

Document Type Definition: Definition, SGML, Markup language, XML, HTML, XML schema, Namespace,...

XML Base: XML, W3C Recommendation, Uniform Resource Identifier, World Wide Web Consortium

XML Tree: XML, XPath, Information Set, Web Service, W3C, Open Standard, Internet