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Are there well known knowledge representation schemes that unlike OWL are based on n-ary relations?
No, that's a good overview. What about KL-ONE?
KL-ONE is another knowledge representation language that uses n-ary relations. It represents concepts as sets of necessary and sufficient conditions and allows for inheritance and default reasoning. It was one of the first description logics, which are a family of knowledge representation languages that allow for the representation of structured knowledge.