[Zope] Creating a ZClass based off Page Templates

I'm trying to make my pages catalog automatically, but to do this I'm told I need to create a ZClass wrapper that is catalog aware. It's pretty easy to do this based off a DTML-Document. No problems. But when I started with Zope I got the impression that DTML was the devil - use Page Templates! I've been using Page Templates for everything to date. I can't seem to base a Zclass off a Page Template, as its not in the list of classes. So, er, how shall I accomplish this? Ed