专用语言简化了对问题的描述，这本身也是一种抽象行为。

A specific language provides a simplification of the things it describes; it's also an abstraction.

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只需创建一个接口，用它描述Collection应该提供的抽象行为。

All you need to do is create an interface that describes the abstract behavior the Collection should provide.

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我们需要告知代码生成器，哪个组件将公开此抽象行为，因此我们创建了一个组件类型文件。

We need to tell the code generator which component type will expose this abstract behaviour, so we will create a componentType file.

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