| 摘要 |
PROBLEM TO BE SOLVED: To provide a data retrieval method for retrieving data with version information indicating a derivation out of a piece of certain data, using version information. SOLUTION: The data retrieval method includes score calculation of retrieval results by using the version information for each piece of data hit on a retrieval condition. The version information includes data version numbers, updating time and so on. A retrieval rank is determined for data group before derivation by consolidating respective scores. COPYRIGHT: (C)2006,JPO&NCIPI
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