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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.
XSD (XML Schema Definition) is a World Wide Web Consortium (W3C) recommendation that specifies how to formally describe the elements in an Extensible Markup Language (XML) document.ust as in XML and HTML, elements are defined within a set of tags. XSD has several advantages over earlier XML schema languages, such as Document Type Definition (DTD) or Simple Object XML (SOX).