[ZODB-Dev] Best use for an OOBTree

[dvd]

Hi all,
I'm trying to figure out the best use for an OOBTree, but I need some
help.

I'm writing a framework around ZODB, this framework must have a
hierarchy concept of users.

Example:

An application can manipulate objects A and B, I could have three users
U1, U2 and U3.
U1 and U2 read and modify different instances, U1 cannot read or modify
U2 objects and vice-versa.
U3, otherwise, is a parent of U1 and U2, and can read all his own
children objects.

My doubt is:

Is it better:
1. to have a *big* OOBTree that collects all the objects, and then keep
in U1 and U2 an OOBTee of ids referring
the objects in the big one. 

2. keep separate the U1 and U2 objects and let U3 search through all
child OOBTree

The second choice looks more simple to implement, but it increases the
complexity of U1 searches.

thank you for any ideas (and sorry for my poor English)
david


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