Fulfill the research of version graphic model based on design history, describe and express complex inheritance relationship of general versions.

完成基于设计历史的版本图结构模型研究，描述和表示广义版本之间的复杂继承关系。

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ooRexx fully supports such aspects of object orientation as polymorphism, inheritance, and important libraries, such as TCP/IP and mathematics, so that Rexx programs can solve complex requirements.

ooRexx 完全支持多态性、继承性和重要的库（例如 TCP/IP 和算法）等面向对象的方面，从而使 Rexx 程序可以满足较为复杂的要求。

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One of the characteristics of object_oriented software is the complex dependency that may exist between classes due to inheritance, association and aggregation relationships.

面向对象软件的一个突出特点就是存在于类间的复杂依赖关系：继承、聚合和关联。

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