针对著名的 RBAC96模型的不足之处 ，结合私有权限、部门权限和权限属性变化等问题 ，对角色权限及角色层次关系进行了分析 ，提出了一个改进的角色层次化关系模型 。
In this paper, we introduce the role-based access control model, analyse the role hierarchy model and the problem of private permissions in RBAC96, and point out the disadvantage of Sandhu s solution.
该表示在最高的抽象层次上展示了角色和过程之间的关系，这适用于概括了解业务过程。
This representation shows the relationship between roles and processes at a high level of abstraction, which is suitable for getting an overview of a business process.
关系型数据库已经超越了持久性存储设备的角色，它们还解决了上述层次数据库的两个缺点。
They also address the two shortcomings of hierarchical databases listed above. The major characteristics of relational type databases are.
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