[Zope] returning ids from objectValues in External Method

I have a question that has *got* to have a simple answer, but I can´t seem to figure it out. I am trying to return a list of ids from an External Method, after they have been sorted and selected according to some simple search criteria. The code looks something like this (stripped down to the basics): idList=[] for OB in self.objectValues('HTML Document'): idList.append(getattr(OB, 'id') return idList And I get back a list of empty items (or empty strings with repr(getattr(OB, 'id')) - [,,,,,,] or ['','','','',''], respectively. I can get any other attribute (title, etc.), but not the id. Sigh. I clearly don't get it yet... Thanks for any help, JP JP Glutting zope@cochrane.es