Brachman, R. J. and Israel, D. J. Some Remarks on the Semantics of Representation Languagesin On Conceptual Modelling: Perspectives from Artificial Intelligence, Databases and Programming Languages, Springer Verlag, 1984.
It has been said many times that semantic nets are mere notational variants of predicate calculus. But before we lay down our nets, we ought at least to be clear about what predicate calculus is. We will attempt to make some clarifications in this regard. We also devote some attention to the notions of semantic nets. In the end, we simply plead, for an open mind.