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Here is my solution. It's cleaned up a bit and uses subtypes. I think that this is probably the most straightforward way to do this. trait RegionUpperBound trait CountyUpperBound extends RegionUpperBound trait DistrictUpperBound extends CountyUpperBound trait TownUpperBound extends...

Here's one somewhat verbose solution I've found. Basically, the relationships of "administers" and "administeredBy" are captured in traits and then each type of organization incorporates the applicable traits. (This is Scala.) It's wordy, but it does ensure that only the correct relationships...

I have a set of objects that represent different levels in a hierarchical organizational structure, in this instance a statewide school system. At the bottom of the hierarchy is the school. It is administered by a town, which is administered by a disctrict, and so forth, like this: State...