XML

Extensible Markup Language.

XPath

XML Path Language. An expression language used by XSLT to access or refer to parts of an XML document.

XSL

Extensible Stylesheet Language Family. A family of recommendations for defining XML document transformations and presentation. It consists of XSL Transformations (XSLT), XML Path Language (XPath), and XSL Formatting Objects (XSL-FO).

XSL-FO

XSL Formatting Objects. An XML vocabulary for specifying formatting semantics.

XSLT

XSL Transformations. A language for transforming XML.