Just an idea of a newbie, if there is no other caching-possibility maybe creating and using a special folder-object as a subobject of the standard folder-object with a property of the wanted info, i.e. PARENTS[3:], which changes whenever the folder is created and copied elsewhere in the hierachy is a solution. Maybe it can be achieved with the products "AbacadabraObject" and "PropertyFolder" ... To my knowledge it is possible to add a script (i.e. localroot.py) as a zope-property, at least for the property-types "multiple selection" and "selection". HTH Elena