<!-- <?xml version="1.0" ?> <!DOCTYPE chapter PUBLIC "-//KDE//DTD DocBook XML V4.2-Based Variant V1.1//EN" "dtd/kdex.dtd"> To validate or process this file as a standalone document, uncomment this prolog. Be sure to comment it out again when you are done --> <!-- <chapter id="gui-elements"> <title>&GUI; Elements</title> <sect1 id="gui-introduction"> <title>Introduction</title> </sect1> <sect1 id="parents"> <title>Parents</title> </sect1> <sect1 id="mixers"> <title>Mixers</title> </sect1> </chapter> -->