Sectioning elements

Figure 978. Recursive sections Slide presentation
<chapter version="5.1"
  xmlns="http://docbook.org/ns/docbook">
  <title>Top</title>
  <section>
    <title>Level 1</title>
    <section>
      <title>Level 2</title>
      <section>
        <title>Level 3</title>
        <para>Hello!</para>
      </section>
    </section>
  </section>
</chapter>
<html>
  ...
  <body>
    <h1>Top</h1>
    <h2>Level 1</h2>
    <h3>Level 2</h3>
    <h4>Level 3</h4>
    <p>Hello!</p></body>
</html>

Figure 979. Non-recursive sections Slide presentation
<chapter version="5.1"
  xmlns="http://docbook.org/ns/docbook">
  <title>Top</title>
  <sect1>
    <title>Level 1</title>
    <sect2>
      <title>Level 2</title>
      <sect3>
        <title>Level 3</title>
        <para>Hello!</para>
      </sect3>
    </sect2>
  </sect1>
</chapter>
<html>
  ...
  <body>
    <h1>Top</h1>
    <h2>Level 1</h2>
    <h3>Level 2</h3>
    <h4>Level 3</h4>
    <p>Hello!</p></body>
</html>

See <chapter>, <section>, <sect1>, <sect2>, <sect3>, <sect4>, <5>, <sect5>, <sect6>, <simplesect>, <refentry>.