&lt;!DOCTYPE note PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
          "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"&gt;
&lt;note&gt;&lt;title&gt;Upcoming Changes&lt;/title&gt;
&lt;para&gt;
Future versions of this feature may not be backward-compatible.
Consider implementing the revised interface now.
&lt;/para&gt;
&lt;/note&gt;