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XFORMS
A rich XML-based web formsstandard.

XHTML
XML compliant HTML.

XML
Extended Meta Language.

XML STREAMING ENGINE
A powerful DNAOS engine providing parallelprocessingpipelines management services for streamingXML.

XLINK
Extended Linking Language, an XML linking extension standard.

XPATH
A standard Extended Path Language.

XQUERY
Extended Query Language, a standardXPath extension.

XSL
Extended Stylesheet Language; a large stylesheet language standard of which the XSLT. subset is currently the only fully complete standard.

XSLT
Extended Stylesheet Language for Transformation, a standardXPath extension and a subset of XSL; a powerful functional programing language, designed to process XML.