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Full-text index producing device for producing a full-text index and full-text data base retrieving device having the full-text index

  • US 6,189,006 B1
  • Filed: 03/02/1999
  • Issued: 02/13/2001
  • Est. Priority Date: 04/19/1996
  • Status: Expired due to Fees
First Claim
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1. A full-text index producing device for producing a full-text index, comprising:

  • extracting means for extracting from a full text database;

    key character sequences of N characters as extracted sets, where N is a positive integer;

    contexts having any one of said extracted sets; and

    character location information representative of a respective location of each of said extracted sets;

    context classifying means for classifying each of said contexts into a classified context, each said classified context having a respective classification number determined by an arithmetic or logical operation involving values of characters of said classified context; and

    producing means for producing said full text index based on said character location information, sorts of said extracted sets, and said classified contexts.

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