This paper addresses an extended order-sorted logic that can deal with structured sort symbols consisting of multiple ordinary words like noun phrases, and proposes inference rules for the resolution process semantically interpreting the sort symbols word by word. Each word in a sort symbol can represent a general concept or a particular object, which is a variable or a constant having the word itself as the sort symbol. It may be a proper noun or variable. This paper also describes an application scheme of the proposed inference rules and an algorithm for judging the subsort relation between complex sort symbols.
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