&lt;!DOCTYPE equation PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
          "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"&gt;
&lt;equation&gt;&lt;title&gt;Fermat's Last Theorem&lt;/title&gt;
  &lt;alt&gt;x^n + y^n &amp;ne; z^n &amp;forall; n &amp;gt; 2&lt;/alt&gt;
  &lt;graphic fileref="figures/fermat.png"/&gt;
&lt;/equation&gt;