Hi doru
in association we (simon and me) have problems with above: and below: (which only works for inheritance) we suggest from: to: which would have the benefit that when we do not want to distinguish between access and reference give us the interface with want.
Access from a method to a structure Access accessor a method to a structure Reference from a method to a structure Inheritance from a class to its superclass
Then I do not understand why the instance variable is defined both in the class and its superclass either we have abstract methods in Association and no state in Association and attributes in subclasses.
or we have state in Association and method in subclass reuse this state (= no definition of other iv in subclasses)
To help debugging we prefer to have state in subclasses and abtsract superclass methods. Stef