<snip explanation of hierarchy need> David Kankiewitz (not sure if I spell his name correctly) implemented something very alike for the zdp site. We had a rather lengthy discussion on the ins and outs of such a hierarchy in February or March on the zdp list. You may want to check out the archives at http://lists.zope.org/pipermail/zdp/ for details. There is probably also more information at the zdp list. Sending a mail to the zdp list may also get you some information. The current organization of the zdp site in subjects and topics is based on David's work. You can have a look at it http://zdp.zope.org hth Rik