针对这一缺点，提出了一种面向用户属性的RBAC模型，在原有RBAC模型的基础上添加了属性集合和约束。
According to this disadvantage, a user properties oriented RBAC model is put forward. The attributes collection and constraints are added based on the original model.
本文详细介绍了用户角色自动指派的组成模型、用户状态迁移、属性表达式规则、约束以及某电子书店系统中的角色自动指派实例。
This article describes the component of AURA, the transition of user-state, the attribute express, constraint and an instance of AURA in an electronic bookstore.
该模型引入复合属性表达式和复合权限的概念，制定授权约束规则，为用户分配多组角色。
It introduces notions of composite attribute expression and composite permission, defines different multiple role groups and makes a finite set of rules to assign user to roles.
该模型引入复合属性表达式和复合权限的概念，制定授权约束规则，为用户分配多组角色。
It introduces notions of composite attribute expression and composite permission, defines different multiple role groups and makes a finite set of rules to assign user to roles.
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