[Zope] DTML namespace problem (was: dtml-tree issue)

[Vangelis Mihalopoulos]

Hello,

i have focused my problem on this:

having a Python Script "testScript":
------------------------------------
class obj:
 a = 1
 b = 2
 c = 3

return obj()
------------------------------------

and a DTML Document "testWith":
-------------------------------
<dtml-with testScript>
  <dtml-var a>
</dtml-with>
-------------------------------

when i try to view the DTML Document, i get an "Unauthorized" Exception.....
I believe this has something to do with the security mechanism of Zope. 
What must i return from the Python Script in order for the DTML Document 
to work?

Thanks for any help