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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.
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.SD 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.