<book xml:lang="de"
      xmlns="http://docbook.org/ns/docbook"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:xlink="http://www.w3.org/1999/xlink"
      xsi:schemaLocation="http://docbook.org/ns/docbook http://www.docbook.org/xml/5.0/xsd/docbook.xsd
                          http://www.w3.org/1999/xlink http://www.w3.org/1999/xlink.xsd">

  <chapter>
    <title>
        <link xlink:href="http://www.web.de">linklabel</link>

    </title>
    <para> Hi there </para>
  </chapter>

</book>