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Condition for file change

<?xml version="1.0"?> <project name="Apache Ant Properties Project" default="compile" basedir=".">   <fileset dir="." id="uptodate.id">     <include name="src/jstl/One.java"/>   </fileset>   <property name="jstl.src" value="jstl"/>   <property name="jstl.jar" value="jstl.jar"/>        <condition property="jstl.src.exists">     <available file="${jstl.src}" filepath="./src"/>   </condition>   <condition property="jstl.jar.exists">     <available file="${jstl.jar}" filepath="./lib"/>   </condition>   <condition property="uptodate">     <uptodate>       <srcfiles refid="uptodate.id"/>       <mapper type="merge" to="./One.java"/>     </uptodate>   </condition>   <target name="checkout-jstl" unless="jstl.src.exists">     <echo message="Checking out ${jstl.jar}"/>   </target>   <target name="build-jstl" depends="checkout-jstl" unless="jstl.jar.exists">     <echo message="Building ${jstl.jar}"/>   </target>   <target name="compile" if="uptodate">     <echo message="File changed: ${uptodate}"/>   </target>     <condition property="is.fileset">     <isreference refid="uptodate.id" type="fileset"/>   </condition>   <target name="fileset-prepare">     <echo message="Value of is.fileset = ${is.fileset}"/>   </target> </project>                     AntBasicTags.zip( 2 k)