Extensible Stylesheet Language (XSL) is a language which allows one to describe how files encoded in the XML standard are to be formatted. The language has two parts
XSL formatting objects are less widely supported. Most (?all) current implementations are only partial. FOP, from the Apache project, can render a large portion of the XSL formatting objects specification to PDF and other output formats. The PassiveTeX package is another implementation that uses TeX to convert the output of an XSL-FO stylesheet to PDF.
More file formats are supported to various degrees.
See also: