[Zope] Adding properties to all objects of a certain type

[Carl Blesius]

I want to add certain properties to objects of a certain type without
having to use the web interface (there are too many of them)...
 
e.g. I would like to add the following properties to all folders:
title_en (string), nickname (string), nickname_en (string), template
(string), reviewed (boolean)
and the following to all DTML-Documents:
lang (string), nickname (string), template (string), keywords (string),
author (string), reviewed (boolean)

A few documents and folders on the site have these properties already (is 
this a problem?).

And after I add these properties to all documents and folders how do I get
Zope to add them to new ones automatically?
I want to keep everything as simple as possible... i.e. no Z Class to
worry about when upgrading, etc.
 
Concrete examples would be appreciated (theoretically I know it is
possible with Zope considering what I have been able to do up to this
point as a greenhorn!).
 
Thanks,

Carl.