In init target set the properties

 
<project name="YourName" default="all">
  <target name="all" depends="init,clean,compile,createJars,copyBuild" >
  </target>

  <target name="init" description="Project">
    <property environment="env" />
    <property name="j2sdkApi" value="${env.JAVA_HOME}/jre/lib/rt.jar" />
      <property name="src" value="./src" />
    <property name="build" value= "./build" />
  </target>

  <target name="clean" description="build" depends="init">
    <delete dir="${build}" />
    <mkdir dir="${build}" />
  </target>

  <target name="compile" description="compile" depends="init">
    <javac srcdir="${src}" destdir="${build}" >
      <classpath path="${j2sdkApi}" />
            <include name="**/application/**"/>
      <include name="**/types/**"/>
    </javac>
  </target>

  <target name="copyBuild" description="desccription here">
    <copy file="${src}/LOGOUNB_CAPA.JPG" todir="${build}/" />
    <copydir src="${src}/config" dest="${build}/config" />
  </target>

  <target name="createJars" description="jars" depends="compile">
    <mkdir dir="${build}/xml/jar"/>
    <jar jarfile="${build}/br/xml/jar/xpfg.jar"
       basedir="${build}/unb/cic/xml" />
      <manifest file="manifest.mf">
        <attribute name="Main-Class" value="${build}/br/unb/cic/xml/XMLMain" />
      </manifest>
  </target>

</project>

1.	Value in the properties file overwrite the value in the build.xml
2.	Redefine property in the children target
3.	Redefine property in the children target 2
4.	Load file through URL
5.	Referrence property: basedir
6.	Custom properties
7.	Define custom property based on existing properties
8.	Ant buildin properties
9.	Separate two values
10.	Reference ant.project.name
11.	Define and reference property

In init target set the properties : Properties « Ant « Java

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