Extensible Stylesheet Language
n. (XSL, abbr.)
A standard to indicate how an Extensible Markup Language (XML) document is to be formatted for user display.
Notes
XSL is defined by the World Wide Web Consortium (W3C). XSL differs from Cascading Style Sheets (CSS) in two main areas. XSL cannot be used with Hypertext Markup Language (HTML) documents, and XSL has the ability to use Extensible Stylesheet Language Transforms (XSLT) to change an XML document to another XML document with a different structure.