[Zope] call DTMLMethod with parameter from Python

Hello: I'm working in a skin within CMF 1.2 and Zope 2.5.0... I'm trying to clarify how to call a DTML Method with parameters from a python script. The docs I've read say to call it something like this: result_string = context.myDTMLMethod( None, _, optionalkey1='yada' ) But the python script I have is being called from a Page Template as a result of a form action. I don't understand how to change this to work without the _ or how to pass a REQUEST mapping to the DTMLMethod. Currently, when I make the call: result_string = context.formatResult() result_string actually contains the dtml code of formatResult (un-rendered) . What causes this? Lack of parameters? What am I missing here? Kind Regards, Damon.