title: How to generate pdf from docbook 5.0
body: <p>I've written a docbook 5.0 document with the header:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;book version="5.0" xmlns="http://docbook.org/ns/docbook"
        xmlns:xlink="http://www.w3.org/1999/xlink"
        xmlns:xi="http://www.w3.org/2001/XInclude"
        xmlns:svg="http://www.w3.org/2000/svg"
        xmlns:m="http://www.w3.org/1998/Math/MathML"
        xmlns:html="http://www.w3.org/1999/xhtml"
        xmlns:db="http://docbook.org/ns/docbook"&gt;
  </code></pre>
  
  <p>and docbook2pdf on Ubuntu 9.10 prints many error messages and doesn't do any pdf document. The  errors are:</p>
  
  <pre><code>openjade:test.xml:2:0:E: prolog can't be omitted unless CONCUR NO and LINK EXPLICIT NO and either IMPLYDEF ELEMENT YES or IMPLYDEF DOCTYPE YES
  openjade:test.xml:2:0:E: no document type declaration; will parse without validation
  openjade:/usr/share/sgml/docbook/stylesheet/dsssl/modular/print/dbtitle.dsl:18:5:E: flow objects at the root must be all of class scroll or all of class page-sequence or simple-page-sequence
  openjade:/usr/share/sgml/docbook/stylesheet/dsssl/modular/print/dbbibl.dsl:704:4:E: flow objects at the root must be all of class scroll or all of class page-sequence or simple-page-sequence
  </code></pre>
  
  <p>docbook2pdf for document in the docbook 4.5 format with normal header like: </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd"&gt;
  </code></pre>
  
  <p>works quite OK.</p>
  
  <p>Is there any way to generate pdf from docbook 5.0?</p>