Higher-order Concepts in a Tractable Knowledge Representation
Due to the intractability of providing the full set of higher-order logical inferences, the introduction of higher-order concepts Into knowledge representation formalisms is usually avoided. In fact, this needn’t be so. We present the knowledge representation of the knowledge acquisition system BLIP, and describe how higher-order concepts are represented by using metapredlcates We then show that metapredicates have the necessary properties to qualify for inclusion in a knowledge representation: they can be given a precise semantics, and allow a natural set of Inferences to be provided effectively. We specify the inference rules for the representation, and prove they are fact-complete and tractable.
KeywordsSugar Aspirin Acetyl Salicyl Alse
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