This paper introduces the definition and denotation of classes in DOOD, then discusses the derived classes created by rules based on them.
文中给出了在DOOD中类的定义和表示，并以此为基础介绍了利用规则生成派生类。
This paper introduces the definition and denotation of classes in DOOD, then discusses the derived classes created by rules based on them.
文中给出了在DOOD中类的定义和表示，并以此为基础介绍了利用规则生成派生类。
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