title: Generate PDF/HTML from Doxygen's Docbook Output
body: <p>Doxygen 1.8.4 included a patch which adds Docbook support. This can be enabled via GENERATE_DOCBOOK.  I've tried it with an existing code base and I am able to generate a <code>docbook</code> directory containing xml files.  </p>
  
  <ul>
  <li>How can I generate a PDF file from that output?</li>
  <li>How can I view the docbook output in a web browser?  This question may not be relevant if the content will be identical to the standard doxygen output, but I'm curious.</li>
  </ul>