您可以建置您的实体和它们的属性、 定义关联性和其条件约束，并在设计工具建立继承阶层架构权限。

You can build your entities and their properties, define relationships and their constraints, and create inheritance hierarchies right in the designer.

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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.

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