| 摘要 |
In an object oriented language, a class object is modified by using meta operators to create a floating class object by copying from a class object, modifying the floating class object into a new class object and link the new class object with its original class object by a linking describing both the history of the modification and the relationship between the new class object and the original class object, and an instance object is modified by using meta operators to create a floating instance object by modifying the existing instance object and linking the modified instance object with its original class object by a link describing the modification and the relationship between modified instance object and the original class object.
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