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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.
JSON is Like XML Because. Both JSON and XML are self describing (human readable) Both JSON and XML are hierarchical (values within values) Both JSON and XML can be parsed and used by lots of programming languages. Both JSON and XML can be fetched with an XMLHttpRequest.