6. Other standards associated with XML or derived from XML

6.1 Presentation of XML documents : CSS and XSL

An XML document does not in itself (except, of course, in the case of XHTML pages) carry the presentation information that enables it to be formatted on a given medium: it must therefore be accompanied by a formatting specification, or style sheet. This term evokes a declarative formalism in which a set of rules associates XML element types with presentation properties, in a way that may depend on the context of the element's occurrence.

There are in fact two standardized style sheet formalisms applicable to XML: Cascading Style Sheets (CSS) and XSL (eXtensible Stylesheet Language).