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

[Gregoire Weber]

Salut Jean-Marc,

>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.

Well stated!

I'll updating the README.txt this week by something similar to that:

   The unique ids generated by CMFUid *are unique by CMF instance*.

   On imports existing CMFUid uids get deleted to avoid doubling
   uids.

Gregoire