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<set><title>The Perl Series</title>
<setinfo>
  <corpauthor>O'Reilly &amp; Associates, Inc.</corpauthor>
</setinfo>

<book><title>Learning Perl</title>
<chapter><title>...</title><para>...</para></chapter>
</book>

<book><title>Programming Perl</title>
<chapter><title>...</title><para>...</para></chapter>
</book>

<book><title>Advanced Perl Programming</title>
<chapter><title>...</title><para>...</para></chapter>
</book>

</set>