Klaus Herrmann writes:

I have the following problem: i have a dtml-tree listing the directory structure. but i want to be able to define a property called "hidden" (bool) on folders. these hidden folders mustn't appear in the tree. any ideas how this could be done? You should look at the tree attribute "branches_expr" (Zope book or URL:http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html) and at "ZopeFind" (--> ZQR Zope Quick Reference).

Dieter