[Zope-CMF] Re: CMFUid isn't generating real uids

[Jean-Marc Orliaguet]

Lennart Regebro wrote:

> It may be worth noting the difference between a unique ID and a 
> universally unique ID. These typically are very different with very 
> different goals and applications.
>
Hi!

I think that the confusion comes from the fact being "unique" is not a 
property that something has intrinsically (as for an object being "red", 
"blue", ...) even though the expression 'X is unique ' is a one-place 
predicate. - but in fact it always has to be taken in relation to a 
policy that needs to be enforced throughout. In the context of a "unique 
ID" the policy can be enforced inside a same folder, in the case of a 
universally unique ID the policy must be enforced inside the context 
that the term "universal" refers too -  So "uniqueness" is more of the 
nature of laws, regulations, concepts, habits (...) than of the nature 
of a quality, and this is why the best UID generator is the one that can 
best enforce a given policy.

Regards /JM