<project name="main" default="build" >
...
<target name="build" depends="prepare"
    description="build the model and application modules.">

  <ant dir="./model" target="package">
    <property name="outdir" value="/tmp/app" />
    <property name="setProps" value="true" />
  </ant>

  <ant dir="./application" target="package">
    <property name="outdir" value="/tmp/app" />
    <property name="setProps" value="true" />
  </ant>
  ...
  </target>
</project>
