[Pharo-users] Ring question

I'm trying to look into Ring implementation. So I have a first question. Why is RGAbstractContainer and subclasses irregular? Is that on purpose? Details: RGAbstractContainer delegates adding a new element to the element being added, via aRGElement>>#addInContainer:. This element is then expected to use RGContainer>>#addTrait:/#addPackage:/#addMethod: etc... However only a subset of the RGElements implement #addInContainer:; for example, RGTrait does not implement #addInContainer: (*). (*) Ok, RGContainer>>#addTrait: calls RGContainer>>#addClass:, and RGTrait being a subclass of RGBehaviorDefinition, that works. But I'm still ?? Thierry