§4.6.(a) Private methods from super classes
(Cf. §3.4.(d))
If a callin binding shall bind to a private base method, that method
must be defined in the exact base class to which the current role
class is bound using playedBy
.
If a private base feature must indeed be callin-bound, a role class
must be defined that is played by the exact base class defining the
private feature. Another role bound to a sub-base-class can then
be defined as a sub class of the first role. It will inherit the
callin binding and through this it can access the desired feature.