Cannot find the class file that maps to the JUnitReport task

[Wheeler, Bill]

Hello -

I am new to ant, and having trouble getting the optional task 'JUnitReport'
to run.

In my project xml file i am defining optional task definitions like this:

<taskdef name="junitreport" 
        classname="org.apache.tools.ant.taskdefs.optional.junit.???"/>

But i looked in my optional.jar archive to see which class this task uses,
and it is not obvious to me. 

Can some one tell me which class file is used by the JUnitReport task?

Thanks in advance

Bill Wheeler
MSDW Online