Semantics - What is Inheritance and Conditional Inheritance?

Semantics - What is Inheritance and Conditional Inheritance?

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Proposal-1:  Inheritance (Rich Heidtman):
When one actor defintion extends from another actor definition all the fields of the first actor definition are acquired through inheritance from the second actor definition.
Example: car inheritance fields from vehicle, where car is 2nd actor definition and vehicle is 1st actor definition
Syntax Example: actor car **extends** vehicle

Proposal-2:  Conditional Inheritance (Rich Heidtman):
When one actor extends from another actor with conditional inheritance: constraints must hold given the rules of conditional inheritance.
Example: vehicle constraints must hold (ActorType = vehicle, VehicleCategory = sedan)
Early Syntax Example to help understand: actor car **extends** vehicle(actorType = vehicle, vehicleCategory = sedan)