您可以定义通用业务对象来对不同业务对象表示形式进行统一。
You must define a generic business object to unify the different business object representations.
托管角色采用通用业务对象，指向将在运行时保存关系实例 ID 的键属性。
The managed role is typed with the generic business object and points to the key attribute that will hold the relationship instance id at run time.
因为源或目标必须为通用业务对象，而且每个关系中只存在一个托管角色，因此不需要托管角色名称。
Because either the source or the target must be the generic business object and only one managed role exists per relationship, the managed role name is not needed.
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