[Zope] complex property types

Hi, I'd want to add properties to a bunch of existing Zope objects, but these properties are in the form of nested mappings. Is there a possibility to do so with or without (by program) the ZMI ? I plan to store this as a string of text and evaluate it at runtime, but this is far from being optimal or easily maintainable. any idea ? Thanks in advance Jerome Alet -- (c) 1928-???? The letters U, S, and A and the U.S.A. flag are the copyrighted property of Disney Enterprises Inc. Any infringment will be punished with the death penalty. Details : http://yro.slashdot.org/article.pl?sid=03/01/15/1528253&tid=123