DATA STRUCTURE, DATABASE SYSTEM, AND METHOD AND COMPUTER-READABLE MEDIUM STORING PROGRAM FOR DATA MANAGEMENT AND/OR CONVERSION

摘要

A database system for creating a database of a directory tree form by associating each of one or more association nodes with one or more topic nodes, each of the one or more topic nodes having data belonging thereto, and an association attribute being defined to represent each of associations between the associated association nodes and topic nodes, the database system including a directory tree creating element for creating an association node entry for each of the association nodes and an association attribute entry for each of the association attributes, and for creating a directory tree by correlating the entries in accordance with an association between the respective association node and the respective association attribute; and a data correlating element for correlating the data belonging to one of the topic nodes with the created association attribute entry in accordance with an association between the topic node and the respective association attribute.