[Zope] hide nested classes in a python products -- how?

[Tobias Herp]

Hi,

I'm re-implementing my nested ZClass product as a python product.

The ZClass product contains a class 'portal' which is the only one whic=
h
should be add-able to any ordinary folder, and a cascade of further cla=
sses
which can be added inside the portal.

In my classes I'm able to restrict the list of contained classes via
_allowed_meta_types. But in an ordinary Folder, any object can be added=
.

Is it possible to prevent the further classes to show up in the normal
list, so that only 'portal's can be added to a normal Folder object? Or=
 is
the only solution to throw an exception?

tia,

Tobias
--
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