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Information storage and retrieval system

  • US 4,267,568 A
  • Filed: 11/01/1977
  • Issued: 05/12/1981
  • Est. Priority Date: 12/03/1975
  • Status: Expired due to Term
First Claim
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1. A method utilizing digital data processing means for creating a multi-layer data base in a store and for reproducing the data base comprising the steps of:

  • (a) receiving as input a sequence of first level events which represent a sequence of first level entries, the first level entries forming a sequence of second level events within a plurality of second level entries;

    (b) utilizing the events and entries, received as input, for creating a multi-layer data base in the store including the steps of;

    (1). forming digitally coded signals in a first data base layer representing the order of occurrence of first level events in each of a plurality of first level entries, and(2). forming digitally coded signals in a second data base layer representing the order of occurrence of second level events in each of a plurality of second level entries, each of a plurality of second level events represented in the second layer having a corresponding first level entry represented in the first layer, such first level entry being represented by the order of occurrence of first level events within such first level entry; and

    (c) reproducing events and entries in the same order received as input utilizing the first data base layer to order first level events and utilizing the second data base layer to order first level entries within second level entries.

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