Database Question Hello, I'm a newbie, so this is a newbie question! I am currently preparing to build a web application for property lettings, and I'm very interested in what Zope has to offer. The application will need to recognise a number of different objects, such as "houses", "prospective tenants" and "property owners" (the latter of which I may implement as user types, which would allow these people to log in and amend some of their own information.) I'm very interested in the Object Oriented way of doing things; for example, I'm thinking about implementing houses as a folder-ish object, so it would be able to contain photos of the house in question. The biggest stumbling block I am facing is how to do something "Relational" in an OO environment. Specifically, I've been scratching my head for a while about how to handle a many-many relationship: a property owner may own more than one house; conversely, a house may have more than one co-owner - consequently it's not appropriate to have either containing the other. I've googled for general information about handling many-many relationships in OO, and most of what I've come across has only indicated that it can be tricky! Having a look through past threads on this mailing list I've noticed a few references to mxmRelations (http://www.zope.org/Members/maxm/products/mxmRelations) which seems to match up - have I got the right end of the stick? Before I jump in with this I'd appreciate any advice or guidance you could provide - it'd be greatly appreciated. While Im on, Ive noticed that Zope 3 has been released. Is this now the recommended development environment, or am I better off sticking with Zope 2 for now, and porting my application once Zope 3 is a bit further down the line? Id greatly appreciate any guidance that can be provided on these subjects. Thanks in advance, Jim ___________________________________________________________ Yahoo! Messenger - NEW crystal clear PC to PC calling worldwide with voicemail http://uk.messenger.yahoo.com