Extensible Stylesheet Language (See XML Stylesheet Language
Extensible Stylesheet Language Formatting Objects. See XSL.
XSL Formatting Objects, a language for expressing formatting semantics using an XML vocabulary.
XSL Formatting Objects, or XSL-FO, is an XML markup language for document formatting. XSL-FO is part of XSL, a set of W3C technologies designed for the transformation and formatting of XML data. The other parts of XSL are XSLT and XPath.