这篇文章将向您显示如何建模数组、联合体、抽象类，为属性建模默认值等等。
This article will show you how to model arrays, unions, abstract classes, default values for attributes, and so on.
Response是一种抽象类型，因此，您必须使用具体的扩展填充该数组。
Response is an abstract type, so you have to fill the array with concrete extensions.
TypeDescription 类只是个抽象基类，其中定义了处理三种类型的方法：原生类型、数组和类实例。
The TypeDescription class is just an abstract base class with methods defined for dealing with three kinds of types: primitives, arrays, and instances of classes.
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