并且父亲还可以有父亲，创建一个传递的子类关系后，可以方便地利用内建的issubclass函数来判断继承关系。
And parents can have parents, creating a transitive subclass relation, conveniently accessible with the built-in function issubclass .
在本场景中，可以在父类元素与子类元素之间创建一种关系。
In this scenario, a relationship can be established between these parent and child elements.
逻辑数据模型在此基础上更进一步，分析数据的详细结构，包括关系、子类型、属性和包含关系。
A logical data model takes this a step farther, analyzing the detailed structure of the data, including relationships, sub-typing, attribution and containment.
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