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.
基于角色的委托授权模型旨在解决传统授权管理的集中性和复杂性问题，从而满足分布式计算环境的需求。
Role-Based Delegation Model mainly solves the centralization and complexity questions of traditional authorization management, and satisfies the requirement of distributed computing environment.
针对实际应用中对委托限制多方面需求的实际，在已有工作的基础上，提出了基于层次角色的受限委托模型HRRDM。
To satisfy various restricted delegation requirements of actual applications, on the basis of the existing works, a Hierarchical Role-based restricted delegation Model (HRRDM) was proposed.
角色委托者要对委托角色的使用负责，所以对委托角色进行使用限制是整个模型的关键组成部分。
The grantor of the delegated roles should be responsible for the usage of them, so constraints on the usage of the delegated roles are critical components of the whole delegation model.
角色委托者要对委托角色的使用负责，所以对委托角色进行使用限制是整个模型的关键组成部分。
The grantor of the delegated roles should be responsible for the usage of them, so constraints on the usage of the delegated roles are critical components of the whole delegation model.
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