<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook V3.1//EN">
<book>
<chapter><title>Required Chapter</title>
<para>
At least one chapter, reference, part, or article is required in a book.
</para>
</chapter>
<appendix><title>Demonstration Appendix</title>
<para>
This appendix demonstrates an appendix in a book.  It has the
same broad content model as a chapter.
</para>
</appendix>
</book>