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XSL is a family of recommendations for defining XML document transformation and presentation. It consists of three parts: XSL Transformations (XSLT) a language for transforming XML the XML Path Language (XPath) an expression language used by XSLT to access or refer to parts of an XML document. (XPath is also used by the XML Linking specification) XSL Formatting Objects (XSL-FO) an XML vocabulary for specifying formatting semantics An XSLT stylesheet specifies the presentation of a class of XML documents by describing how an instance of the class is transformed into an XML document that uses a formatting vocabulary, such as (X)HTML or XSL-FO. For a more detailed explanation of how XSL works, see the What Is XSL page. For background information on style sheets, see the Web style sheets resource page. XSL is developed by the W3C XSL Working Group (members only) whose charter is to develop the next version of XSL. XSL is part of W3C's XML Activity, whose work is described in the XML Activity Statement.