<book>
  <chapter>
    <title>First Chapter</title>
      Here is some text.
    <section>
      <title>First Chapter, First Section</title>
        More text here.
      <subsection>
        <title>First Chapter, First Section, First Subsection</title>
      </subsection>
      <subsection>
        <title>First Chapter, First Section, Second Subsection</title>
      </subsection>
    </section>
  </chapter>
  <chapter>
    <title>Second Chapter</title>
  </chapter>
  <appendix>
    <title>First Appendix</title>
    <section>
      <title>First Appendix, First Section</title>
    </section>
  </appendix>
  <appendix>
    <title>Second Appendix</title>
  </appendix>
</book>