&lt;!DOCTYPE equation PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
          "http://www.oasis-open.org/docbook/xml/4.5/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;mathphrase&gt;x&lt;superscript&gt;n&lt;/superscript&gt;
+ y&lt;superscript&gt;n&lt;/superscript&gt;
≠ z&lt;superscript&gt;n&lt;/superscript&gt;
∀ n ≠ 2&lt;/mathphrase&gt;
&lt;/equation&gt;