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Natural language processing system

  • US 5,101,349 A
  • Filed: 03/12/1990
  • Issued: 03/31/1992
  • Est. Priority Date: 03/14/1989
  • Status: Expired due to Term
First Claim
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1. A natural language sentence generating apparatus comprising:

  • (a) grammatical rule storing means for storing a plurality of grammatical rules, each grammatical rule including;

    (a1) a phrase-structure-part in which is described a phrase structure rule representing a grammatical function;

    (a2) a semantic part describing a manner in which attribute information propagates in the phrase structure rule from a particular superordinate category to a subordinate category;

    (a3) a condition part in which an applying condition for said grammatical rule is described; and

    (a4) a message part in which is described a message for imposing limitations on the phrase structure rule utilizing said subordinate category as a new superordinate category;

    (b) searching means for searching the grammatical rules stored in said grammatical rule storing means in accordance with the manner in which the attribute information propagates in the phrase structure rule;

    (c) interpreting means for interpreting the grammatical rules stored in said grammatical rule storing means; and

    (d) generating means for applying one of the grammatical rules extracted from said grammatical rule storing means by said searching means while interpreting said one of the grammatical rules through said interpreting means to generate a phrase structure for the sentence from a set of information on the grammatical function imparted to said one of the grammatical rules.

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