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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This is slightly more complex to implement than the version using concrete inheritance with the Template Method pattern, but is more flexible.

这稍微的更复杂去实现比用模板方法模式在类继承的版本中，但是也更灵活。

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