| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an information storage device in which a system is not complicated even if the device is enlarged along with an increase in the number of uses and the number of data, while allowing various functions to be provided by one kind of data structure utilizing a graph model (oriented graph). <P>SOLUTION: An information storage device uses a graph model which accumulates information by using a data structure constituted of item node dara 111, link node data 112, and arc data 113 of a storage part 11. In this information storage device, when data input/output means 121 accepts a data manipulation request to an item node or a link node and identifies a data change request accompanied by generation of an arc, node connection propriety determination means 124 determines whether or not the upstream and downstream sides of the arc after changed are both the item nodes. Data change means 123 prohibits the data change if the upstream and downstream sides are both the item nodes, and performs the data change if any one (both) of the upstream and downstream sides is (are) not the item node(s). <P>COPYRIGHT: (C)2012,JPO&INPIT |
