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XHTML, RDF compared to
Ximian Mono C# compiler
XML [See also DTD]
    compared to RDF/XML 2nd
    embedding RDF in
    location of, in RDF
    PHP classes for
    processing of
    querying with
    RSS-specific
    well-formed versus valid
XML Retrieval by Reformulation [See XRBR]
XML Schema 2nd
    built-in data types
    compared to OWL
    compared to RDF vocabulary
XML Schema 1.0 specification
XML-RPC, RDF/XML compared to
XML::RSS, Perl module
xml:base property
xml:lang property
XMP (eXtensible Metadata Platform)
XOTcl RDF/XML API
XRBR (XML Retrieval by Reformulation) query language, Seamark
XUL (eXtensible User interface Language)