[Zope] Using the Tree Widget

Is it possible to use the DTML tree widget to build a tree from non-Zope Object items? I'd like to be able to build a tree from information I have stored in a database, unfortunately, the only information and examples I can find on the tree widget shows how to make a tree from Zope Objects. Does anyone have any experience in this area, or can you point me to some web site that may be able to help me? Thanks. -- David VanKirk