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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.
Two Methods: Opening XML Files with a Browser View and Edit XML Files on Windows. XML stands for extensible markup language. HTML is a version of XML used to generate web pages in browsers. The nice thing about XML is that you can use any tags you want and organize them in any way.