[Zope] zcatalog -- returning context of hits on fulltext

Hi all I've got a lot of Word docs and Powerpoint presentations and PDFs etc in the ZOBD, stored with their full text in a property of the containing object, so that all those binary docs are searchable. This works great, but returns only the found objects and the cached properties specified in the MetaDate Table. Wouldn't it be great to be able to give just a line or two of context from the full text, the way Google does? I have a feeling I'm asking for pie in the sky, but if anyone has a brilliant (or a functional) solution I'd be delighted. cheers, -- jean