<?xml version="1.0"?>
<title>Document Title</title>
<chapter><title>Chapter</title>
<section><title>Section Level 1</title>
<section><title>Section Level 2</title>
<section><title>Section Level 3</title>
<section><title>Section Level 4</title>
</section>
</section>
</section>
<section id="
section2.id"><title>Section Level 2 with ID</title>
<section id="
section3.id"><title>Section Level 3 with ID</title>
<section id="
section4.id"><title>Section Level 4 with ID</title>
<para>And finally some text.</para>
</section>
</section>
</section>
<section id="section2id"><title>Section Level 2 with ID (no dot)</title>
<section id="section3id"><title>Section Level 3 with ID (no dot)</title>
<section id="section4id"><title>Section Level 4 with ID (no dot)</title>
<para>And some more text.</para>
</section>
</section>
</section>
</section>
</chapter>
</book>