<?xml version="1.0"?>

<book>
 <chapter><title>XML</title>
   <section><title>The elements of an XML document</title>
   </section>
   <section><title>Parsing XML</title>
    <section><title>DOM</title></section>
    <section><title>SAX</title></section>
   </section>
 </chapter>
 <chapter><title>XSL</title>
     <section><title>templates</title></section>
     <section><title>XPath expressions</title></section>
     <section><title>named templates</title></section>
 </chapter>
</book>