[Zope-dev] Return variables from a DTML Method

I want to change some ZClass properties by getting return results from a DTML Method. Something like this: <dtml-call "myzclass.propertysheets.get('Basic').manage_changeProperties(dtmlM eth(this(),_))">. How do I get the dtmlMeth to return a Mapping? (or should I be doing this a different way?) Thanks.