Document retrieval system involving ranking of documents in accordance with a degree to which the documents fulfill a retrieval condition corresponding to a user entry
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United States of America Patent
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Jul 9, 1996
Issued Date -
N/A
app pub date -
Nov 17, 1993
filing date -
Jul 31, 1989
priority date (Note) -
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status (Latency Note)
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Abstract
A document retrieval system retrieves one or a plurality of registered documents from a document database responsive to retrieval conditions designated by a user. The document retrieval system includes a query converter for converting the retrieval condition designated by the user into a query which has a predetermined normal form in which keywords and at least one type of logical operation out of logical operations AND, OR and NOT are connected, a bibliographical information indicator for indicating a relation between each of said registered documents and keywords and a keyword connection table having relationship values, each of the relationship values representing the degree of relationship between each two keywords. The document retrieval system also includes a selector for referring the inverted file and the keyword connection so as to select one or a plurality of registered documents which satisfy the query, and an outputting circuit for outputting one or a plurality of registered documents selected by the selecting means.
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