Help! HibernatePlugin doesn't support "implements" attribute...?

I have the following set for the hibernate plugin:

          <hibernate
                   destination="${project.generated.src.dir}"
                   package="xxx.mis.hibernate"
                   
javaTypeMapper="middlegen.plugins.hibernate.HibernateJavaTypeMapper"
                   standardGeneratorScheme="increment"
                   lifecycle="true"
                   implements="xxx.mis.hibernate.Reference"
                >
            </hibernate>

And am using Middlegen 2.1.  Running middlegen via ant gives: Class 
middlegen.plugins.hibernate.HibernatePlugin doesn't support the 
"implements" attribute.

The documentation seems to indicate that it should support the 
"implements" attribute.  What am I doing wrong?

Quick help from someone would be appreciated - this is holding a project 
that I'm working on...

Thanks,
David


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