<!DOCTYPE para PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
          "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<para>
Effectivity attributes can be used to keep track of modifications
to a document <phrase revisionflag="deleted">at the word or
sentence level</phrase><phrase revisionflag="added"> as long as the number
and complexity of changes is not too high</phrase>.
</para>