<!DOCTYPE cmdsynopsis PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
          "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<cmdsynopsis>
  <command>cd</command>
  <arg choice='req'><replaceable>directory</replaceable></arg>
</cmdsynopsis>