&lt;!DOCTYPE para PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
          "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"&gt;
&lt;para&gt;
The anchor element&lt;anchor id="example.anchor.1"/&gt; is empty and contributes
nothing to the flow of the content in which it occurs.  It is only useful
as a target.
&lt;/para&gt;