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.
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。
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.
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。
Why doesn't my managed object see the other managed objects that are in a to many relationship to it?
为什么没有我的托管对象看到其他的对象，在一对多的关系吗？
Why doesn't my managed object see the other managed objects that are in a to many relationship to it?
为什么没有我的托管对象看到其他的对象，在一对多的关系吗？
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