A problem that child role cannot obtain private permissions because of inherited relation in the Role-Based Access Control (RBAC) model is researched.
针对基于角色的访问控制(RBAC)模型中由于继承关系产生的子角色不能拥有私有权限问题进行了研究。
Then, the theories of DDM is fully explained in the paper, including the description of DDM, the denotation and operation of domain relation, and the access control method based on DDM.
接着，介绍了域数据模型的一般概念，包括域数据模型的描述、域关系的表示和运算、基于域数据模型的访问控制方法等。
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