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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.
Reasons to choose XML over JSON. 1  Easy to take XML and apply XSLT to make XHTML. 2  XML is supported by many more desktop applications than JSON. 3  JSON can be put in the XML on the way back to the client â the benefit of both! Itâs called XJAX (stands for X-domain JavaScript And XML). 4  Simply, AJAX includes XML in it and not JSON.