[Zope] Unique ID generation

[Tim Moore]

I'm writing a simple ZClass (and a second ZClass which contains the
first) and I would like the constructor for this class to be able to
auto-generate unique IDs for the instances rather than making the
owner choose one.  What I've tried isn't working, but I don't really
know what I'm doing here...I figure this must be a fairly common
problem, so what is the best way to handle it?  The ID needs only be
unique within its container object (i.e., doesn't have to be globally
unique).  I have full control over the container class, so solutions
involving setting properties on that class are OK.

TIA,
-- 
Tim Moore