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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). XSD is written in XML, which means that it doesn't require intermediary processing by a parser.