通过为每个角色提供合适的项数据，模型就可以为视图和委托提供关于怎样向用户显示项的提示。
By supplying appropriate item data for each role, models can provide hints to views and delegates about how items should be presented to the user.
目前已有一些模型扩展了RBAC模型以支持角色委托，但是这些模型对委托限制的支持非常有限。
Currently, there are some models that extend RBAC model to support role delegation. However, their supports for constraints on the usage of delegated roles are very limited.
在基于角色的委托模型中，委托被看作是一种特殊的URA过程。
In a role based delegation model, delegation is seen as a special URA course.
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