Divergent Hierarchies - revisited (2)

Level 3 includes concrete ‘leaf’ objects or ‘real’ dogs, which simultaneously belong to a distinct pair of subclasses at level 2 of the inheritance tree (compositional inheritance of properties).

Each leaf class instance at level 3 has exactly two paths up to level 1; both paths must end up at the same root object (Dog instance).

Partition S1:

(BLACK xor WHITE)

(Mutex and exhaustive):

DOG CLASS

Partition S2:

(BIG xor SMALL)

(Mutex and exhaustive):

Black Dog

White Dog

Big Dog

Small Dog

Big Black Dog

Big White Dog

Small Black Dog

Small White Dog

Level 3 includes concrete ‘leaf’ objects or ‘real’ dogs, which simultaneously belong to a distinct pair of subclasses at level 2 of the inheritance tree (compositional inheritance of properties).