| 摘要 |
PROBLEM TO BE SOLVED: To allow an application data access, even when the structure of data is changed with the lapse of time. SOLUTION: An application described so as to access data structured, in accordance with a 1st data structure specification is allowed to access data structured, in accordance with a 2nd data structure specification changed from the 1st data structure specification. An application described for accessing data structured in accordance with the 2nd data structure specification is allowed to access data structured, in accordance with the 1st data structure specification.
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