Writing a Book

<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
          "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">

<book lang="en">
  <title>My Book</title>
  <chapter>
    <title>My Chapter</title>
    <para>This is my book.</para>
  </chapter>
</book>
     

This example is available here.