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XSL is a language for expressing style sheets. An XSL style sheet is, like with CSS, a file that describes how to display an XML document of a given type. XSL shares the functionality and is compatible with CSS2 (although it uses a different syntax). It also adds: 1  A transformation language for XML documents: XSLT.
In computing, the term Extensible Stylesheet Language (XSL) is used to refer to a family of languages used to transform and render XML documents. Historically, the XSL Working Group in W3C produced a draft specification under the name XSL, which eventually split into three parts: