2 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
3 <book><chapter><title>Required Chapter</title><para>
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4 At least one chapter, reference, part, or article is required in a book.
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5 </para></chapter><appendix><title>Demonstration Appendix</title><para>
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6 This appendix demonstrates an appendix in a book. It has the
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7 same broad content model as a chapter.
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8 </para></appendix></book>