由于角色分层与组织结构无关,导致权限继承不能依赖于系统的组织.提出继承域的概念,建立基于继承域的角色层次模型,给出改进模型的定义、继承规则、约束条件和角色权限求解算法.实例证明改进模型能清晰地反映系统的组织结构,解决权限继承问题.域属性的引入使得角色的层次结构和权限的分级管理简单有效.%Because the role hierarchies have nothing to do with the organization structure, the inheritance of the permission cannot depend on the organization of the system. The domain concept is introduced and a role hierarchical model based on inherit domain is built as well as the related definition, inherit regulation, constraint condition and the algorithm to compute the permission of the role. It is showed by the sample that the modified model could show the organization structure and solve the permission problem easily. The introduce of the domain property makes the hierarchical administration of power and role hierarchy more simply and effectively.
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