Hi, Somebody experience with a parent code table and how to implement it in Zope (with dtml-tree)? Or is a PArent-Code table not SQL-like and is there a better solution? eg : Parent Code Description 0 0 MasterNode 0 1 Child1 of MasterNode 0 2 Child2 of MasterNode 1 3 Child of Child1 .... Thanks in advance, Tom.