中继资料 API 只会传回指定之类别的直接成员宣告，而且需要 API 用户端执行其他呼叫，以查核阶层架构和列举继承的方法。
The metadata API returns only the direct member declarations for a given class and requires the API client to make additional calls to walk the hierarchy and enumerate inherited methods.
这是宣告谁有权来继承“遗嘱人”为族长的一种方式。
It was a mode of declaring who was to have the chieftainship, in succession to the Testator.
如果继承的介面不是宣告为新类别的一部分，则会由负责宣告的基底类别提供实作。
If the inherited interface is not declared as part of the new class, its implementation is provided by the base class that declared it.
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