Derivatives and Integrals: An Annotated Discourse

<appendix label="appendix-structured">
  <title>A Structured Appendix</title>
  <introduction>
    <p>
      A deeply-structured appendix for testing purposes.
    </p>
  </introduction>
  <subsection>
    <title>A Subsection in an Appendix</title>
    <introduction>
      <p>
        Inside a subsection.
      </p>
    </introduction>
    <subsubsection>
      <title>A Subsubsection in a Subsection in an Appendix</title>
      <p>
        Nearly terminal.
      </p>
      <paragraphs>
        <title>Paragraphs in a Subsubsection in a Subsection in an Appendix</title>
        <p>
          The <c>paragraphs</c> element can go in any division,
          but does not get a number.
        </p>
      </paragraphs>
    </subsubsection>
  </subsection>
</appendix>