| 摘要 |
PROBLEM TO BE SOLVED: To efficiently retrieve large-scale data in a semi-structured database. SOLUTION: A designating means 1 designates the structure of a partial tree which can be a retrieving object by using the label, etc., of an edge in tree structure data. An extraction means 2 extracts information of at least one partial tree suited to the designated structure and a storing means 3 gathers information of a node, edge, etc., included in the extracted tree by each partial tree to store in a physical storing area.
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