[Zope] Union of a few folders

[Sin Hang Kin]

I have some folders : news, events, activities, etc, which each of them have
some items.

The application will generate a list of them in reverse date order. This
have been done.

Now, I would like to add a new listing : to list all of them in reverse date
order. i.e., I need to make a union of them first, then sort them. Is it
possible to do this?

Rgs,

Kent Sin