[Zope] Q: External method processing (D/H)TML forms?

Hi, I want to pass input from a DTML form to an external method. So far the DTML is actually just a plain HTML page: <form action="external-method" > <input name="foobar"> <input type=submit value="Process"> </form> If I fill in "test" in the form, my external method is beging called correctly, e.g. the URL is ../external-method?foobar=test as I expected. But how do I access that "foobar" value from Python in the external method? It is currenly defined like: def external-method(self): # is there a self.foobar or something? ... Any help will be highly appriciated by this Zope newbie! Cheers, Jacco