[Zope] NewB Qs: Classification advice please + many2many relationships

Hi Coming from the Java / RDMS world, I'm not sure how best to lay out my new project in Zope. I have Events, and Businesses, both of which have a hierarchy of types (e.g. Events/Entertainment/Films and Business/Entertainment/Theatre, etc.) The events have venues, which are instances of Businesses. My question is: how should I classify my objects, and once I've done that, how do I maintain many-to-many relationships, e.g. all the Events happening at Business X? Any suggestions would be greatly appreciated. Thanks Felix. ____________________________________________________________ Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie