&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;
When Emacs is running under X Windows, the &lt;property&gt;borderWidth&lt;/property&gt;
resource controls the width of the external border.
&lt;/para&gt;