[Zope] Tree Tag & SQL

[ron@rotflol.cx]

I am trying to implemented a directory service using the tree tag where the 
info from several tables of a database.

A simplified outline:

+Locations
 +Offices
  +People
   +Phones
     Tel
     Fax
   +Addresses

Problem: how to have the tree tag use a different SQL method for each level 
WITHOUT resorting to external methods, because the directory should be 
maintainable by mere mortals, not Python or SQL gods.

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