The power and elegance of XSLT - the Extensible Stylesheet Language for Transformations - stems from its ability to transform XML documents into other output formats like HTML, fulfilling one of the original promises of XML: separating content from presentation. XSLT is particularly powerful because a single stylesheet can format all the XML documents conforming to a DTD into HTML for publication on a Web site. The stylesheet can also be used to automatically generate such features as a hyperlinked table of contents, the building of which requires substantial manual work without XML.