[Zope3-Users] Non-owning references in Zope3

[thealx at poczta.onet.pl]

Hi,

I am relatively new to Zope3. I could not find anywhere an example, what is the 'right way' to make non-owning reference to another object in Zope?  
Every piece of zope3 docs is full of examples of containers, this makes a good tree like structure. But how to refer from one object to another in right way?
Can/should I do that with Object field?