The <and> tag selects files that are selected by all of the
elements it contains. It returns as soon as it finds a selector that does not select the
file, so it is not guaranteed to check every selector.
<fileset dir="${src}" includes="**/*.php">
<and>
<size value="1000" when="more"/>
<date datetime="01/01/2011 12:00 AM" when="before"/>
</and>
</fileset>