<?xml version="1.0"?> <project name="Apache Ant Properties Project" basedir="."> <fileset dir="." id="uptodate.id"> <include name="src/jstl/One.java"/> </fileset> <condition property="uptodate"> <uptodate> <srcfiles refid="uptodate.id"/> <mapper type="merge" to="./One.java"/> </uptodate> </condition> <target name="compile" if="uptodate"> <echo message="File changed: ${uptodate}"/> </target> </project>