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.

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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.

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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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