ant/src/etc/testcases/taskdefs/antstructure.xml

<?xml version="1.0"?>
<!--
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  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
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      http://www.apache.org/licenses/LICENSE-2.0

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<project name="antstructure-test" basedir="." default="test1">

  <target name="test1">
    <antstructure/>
  </target>

  <target name="testCustomPrinter">
    <typedef name="myprinter"
             classname="org.apache.tools.ant.taskdefs.AntStructureTest$MyPrinter">
      <classpath>
        <pathelement path="${tests-classpath.value}"/>
      </classpath>
    </typedef>
    <antstructure output="foo.dtd">
      <myprinter/>
    </antstructure>
  </target>

  <target name="tearDown">
    <delete file="foo.dtd" quiet="true"/>
  </target>

</project>