| 摘要 |
PROBLEM TO BE SOLVED: To define an extensible file format compatible with previous, active, and future versions of an application program. SOLUTION: File version watermarks can be included in the original data file of the application program. The file version watermarks can include a high version watermark, a last version watermark, a low version watermark, a creation version watermark, and an object version watermark. Each file version watermark can indicate changes, additions, or deletions made to the file. The present invention can use the file version watermarks to discriminate whether file information corresponds to the previous, active, or future versions of the application program. Accordingly, the present invention can then load or save the original data file on the basis of a result of the discrimination. COPYRIGHT: (C)2010,JPO&INPIT
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