<!DOCTYPE BOOK PUBLIC "-//OASIS//DTD DocBook V3.1//EN" [
<!ENTITY biblio SYSTEM "cases/biblio2.sgm">
]>
<book><title>Book Title</title>
<chapter><title>Test Chapter</title>
<para>The test bibliography contains three entries, only two are 
referred to here:
<xref linkend="Walsh97"> (by xref), and
<citation>AhoSethiUllman96</citation> (by citation).
And another test <xref linkend="ahotest">.
</para>
</chapter>
&biblio;
</book>

