In Section 1.3 we introduce the docbook2pdf and docbook2html applications. They allow you, with the help of Norman Walsh' XSLT stylesheets, to transform DocBook XML sources into PDF and HTML, respectively. The XSLT language, that is used to transform the DocBook XML sources into HTML, XSLT-FO, etc. is described in the W3C recommendation XSL Transformations [REC-XSLT]. There is a nice XSLT tutorial [NICXSLTUT], as well as Mike Kay's book XSLT Programmer's Reference [KAY2001]. The style sheets themselves are also described [DBXSLTDOC].