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XSL is used to refer to a family of languages used to transform and render XML documents. CSS is a style sheet language used for describing the presentation semantics (the look and formatting) of a document written in a markup language. Hence XSL and CSS are not the same and not interchangeable.
XML goes hand in hand with HTML in internet usage. XML defines the structure of the document, but not the way the document is displayed; this is handled by HTML. XSD stands for XML Schema Document, and is one of the several XML schema languages that define what could be included inside the document.