Simon Michael <simon@joyful.com> writes:

Perhaps after an edit I can

try: render new page except: revert to old content

Ok, now after an edit I just call apply(DTMLDocument.DTMLDocument.__call__, (self, None, REQUEST, None)) and if there's a DTML problem zope rolls back the transaction & gives an appropriate error. Right on! I'll update the product on zope.org soon.