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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.
The eXtensible Markup Language is the language that another version of HTML is based on. Like HTML, XML is also based off of SGML. It is less strict than SGML and more strict than plain HTML, and provides the extensibility to create various different languages. XML is a language for writing markup languages.early every acronym on the web that has an âMLâ in it is a â markup language.â Markup languages are the languages that build the web. There are many different markup languages.