&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;
A presentation system using TeX as a back end might allow you
to insert inline markup, such as &lt;markup role="tex"&gt;$x^2$&lt;/markup&gt;,
using TeX syntax directly.
&lt;/para&gt;