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XFORMS
A rich XML-based web formsstandard.

XHTML
XML compliant HTML.

XML
Extensible Markup Language.

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

XLINK
The XML Linking Language standards.

XPATH
The XMLPath Language standards.

XQUERY
An XMLQuery Language standards and XPath extension.

XSL
Extensible Stylesheet Language; an extensive stylesheet language standards of which XSLT was initially designed as a subset. Today, they are complementary standards.

XSLT
The XSLTransformation Language standards, integrating XPath; a powerful functional programing language, designed to process XML.