Keep your inheritance hierarchy simple.
保持简单的继承层次结构。
The reason is simple: The module has an inheritance hierarchy of its own.
原因很简单：模型具有自己的继承层次结构。
Inheritance (and, by extension, polymorphism) in db4o really is that simple.
db4o中的继承(以及多态)其实就是这么简单。
Inheritance (and, by extension, polymorphism) in db4o really is that simple.
db4o中的继承(以及多态)其实就是这么简单。
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