ACL : give a user the right to create objects, but to modify only those he created

[François Beretti <francois.beretti@enatel.com>]

Hello

Almost everything is in the title :

I want to give my users the right to create objects of a given class, 
without giving them the right to modify those created by other users
For the second part I can use the creatorsName attribute, but I don't 
know how I can make a deifference between the right to create an entry 
and the right to modify it.

Is it possible ?

Thank you

François