<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<?sdop toc_sections="no"
  head_length="24"
  head_centre_recto="[&arabicpage;]"
  head_centre_verso="[&arabicpage;]"  
?>

<book>

<chapter>
<title>First chapter</title>
<para>
This is some text.
</para>
</chapter>

<?sdop chapter_skip_head="yes"?>

<chapter>
<title>Second chapter</title>
<para>
This is some text.
</para>
</chapter>

<chapter>
<title>Third chapter</title>
<para>
This is some text.
</para>
</chapter>

<?sdop chapter_skip_head="no"?>

<chapter>
<title>Fourth chapter</title>
<para>
This is some text.
</para>
</chapter>
</book>

