| 摘要 |
PROBLEM TO BE SOLVED: To reduce the cost for extracting, transmitting and storing data and improve the browsing convenience for a user by removing, in extracting data by use of one or more extraction requests (SQL retrieval expression, XPath retrieval expression, etc.), redundancy such that a solution group of different extraction requests includes duplicate elements and, in case that data are data having a tree structure such as XML, redundancy such that a certain solution appears in duplication as a partial tree of the other solution; and to synthesize a solution group of an initial extraction request, as occasion demands, from data from which the redundancy is removed. SOLUTION: After extracting data, the duplication thereof is removed, or the data are extracted in a state including no duplication by use of an extraction request synthesized from a given extraction request. When the solution group of the initial extraction request is to be synthesized later, each data is fetched in a classified state based on how the solution of the initial extraction request should be extracted. COPYRIGHT: (C)2006,JPO&NCIPI
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