<book xmlns="http://docbook.org/ns/docbook"
      xmlns:xlink="http://www.w3.org/1999/xlink"
      version="5.0">
<title>Invalid Book</title>
<chapter xml:id="ch1">
<title>XML?</title>
<para>This is a story about <biblioref linkend="xml10"/> and
<biblioref linkend="xml11"/>. We explicitly and erroneously point
to this chapter with biblioref: <biblioref linkend="ch1"/>.</para>
</chapter>

<bibliography>
<bibliomixed xml:id="xml10"><abbrev>XML 1.0</abbrev>
<citetitle xlink:href="http://www.w3.org/TR/REC-xml/">Extensible
Markup Language (XML) 1.0 (Fourth Edition)</citetitle>. Tim Bray,
Jean Paoli, C. M. Sperberg-McQueen, et. al.
editors. W3C Recommendation 16 August 2006.</bibliomixed>

<bibliomixed xml:id="xmlns10"><abbrev>Namespaces 1.0</abbrev>
<citetitle xlink:href="http://www.w3.org/TR/REC-xml-names/">Namespaces
in XML 1.0 (Second Edition)</citetitle>. Tim Bray,
Dave Hollander, Andrew Layman, et. al.,
editors. W3C Recommendation 16 August 2006.</bibliomixed>

<bibliomixed xml:id="xml11"><abbrev>XML 1.1</abbrev>
<citetitle xlink:href="http://www.w3.org/TR/xml11/">Extensible
Markup Language (XML) 1.1 (Second Edition)</citetitle>. Tim Bray,
Jean Paoli, C. M. Sperberg-McQueen, et. al.
editors. W3C Recommendation 16 August 2006.</bibliomixed>

<bibliomixed xml:id="xmlns11"><abbrev>Namespaces 1.1</abbrev>
<citetitle xlink:href="http://www.w3.org/TR/xml-names11/">Namespaces
in XML 1.1 (Second Edition)</citetitle>. Tim Bray,
Dave Hollander, Andrew Layman, et. al.,
editors. W3C Recommendation 16 August 2006.</bibliomixed>
</bibliography>
</book>

