ANT_17_BRANCH/src/etc/testcases/taskdefs/antlib.xml

<?xml version="1.0"?>
<project name="test">

  <property name="testcases.dir" location="../../../../build/testcases"/>

  <path id="testclasses">
    <pathelement location="${testcases.dir}" />
    <pathelement path="${java.class.path}" />
  </path>

  <target name="antlib.file">
    <typedef file="test.antlib.xml"
             classpathref="testclasses"/>
    <mytask/>
  </target>

  <target name="antlib.resource">
    <typedef resource="taskdefs/test.antlib.xml">
        <classpath>
            <!-- To load the task classes: -->
            <path refid="testclasses"/>
            <!-- For test.antlib.xml: -->
            <pathelement location=".."/>
            <!-- For test2.antlib.xml: -->
            <pathelement location="${testcases.dir}/org/apache/tools/ant/taskdefs/test2-antlib.jar"/>
        </classpath>
    </typedef>
    <mytask/>
    <echo>-and-then-</echo>
    <mytask2/>
  </target>

  <target name="ns.current">
    <typedef file="antlib.current-test.xml" uri="abc"/>
    <x:useecho2 xmlns:x="abc"/>
    <x:preset.echo xmlns:x="abc" name="p"/>
    <x:p xmlns:x="abc">Hello from x:p</x:p>
  </target>

  <target name="antlib_uri" >
    <typedef uri="antlib:org.example.tasks" onerror="failall"/>
  </target>

  <target name="antlib_uri_auto" xmlns:ex="antlib:org.example.tasks">
    <ex:simple>
      <echo message="inside simple" />
    </ex:simple>
  </target>

  <target name="antlib_uri_auto2" xmlns:ex="antlib://org/example/tasks/antlib2.xml">
    <ex:simple>
      <echo message="inside simple"/>
    </ex:simple>
  </target>
  
</project>