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.
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.
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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