<?xml version="1.0"?>
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<article xmlns="http://docbook.org/ns/docbook">
  <section>
    <title>Level 1 (largest)</title>
    <section>
      <title>Level 2</title>
      <section>
        <title>Level 3</title>
        <section>
          <title>Level 4</title>
          <section>
            <title>Level 5</title>
            <section>
              <title>Level 6</title>
            </section>
          </section>
        </section>
      </section>
      <section>
        <title>Also level 3</title>
      </section>
      <section>
        <title>Also level 3</title>
      </section>
      <section>
        <title>Also level 3</title>
      </section>
      <section>
        <title><emphasis Role="strong">not</emphasis> <emphasis>parsed</emphasis></title>
      </section>
    </section>
  </section>
</article>
