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Let’s say I have an entity called EntityA. EntityA has a relationship to EntityB and EntityC. Neither of EntityB and EntityC are mandatory relationships but one of them has to be chosen.
Is it possible to model this in Core Data?
If EntityB and EntityC had a common super-class, you could have a required relationship of that type.
That said, I have heard it said you should stay away from class hierarchies in Core Data.
YMMV