gistfile1.xml

  <property name="release.environments" value="test,uat,production" />
  <target name="package.releases">
    <foreach item="String" in="${release.environments}" delim="," property="release.environment">
      <property name="package.target" value="package.${release.environment}" />
      <call target="${package.target}" />
    </foreach>
  </target>