&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;
Effectivity attributes can be used to keep track of modifications
to a document &lt;phrase revisionflag="deleted"&gt;at the word or
sentence level&lt;/phrase&gt;&lt;phrase revisionflag="added"&gt; as long as the number
and complexity of changes is not too high&lt;/phrase&gt;.
&lt;/para&gt;