A model hierarchy is proposed, and system security under this model hierarchy is defined, and the unwinding theorem of system security is proved.
提出了一个模型层次结构，并给出了在这个模型层次结构下系统安全的定义，获得安全的分解定理。
The roles, privileges and role hierarchy for the EMR systems are defined. The mechanism not only meets the requirement of security, but also ensures the efficiency and generalization of the system.
定义了系统的角色、权限和角色继承，满足了安全性的多种需求，也保证了系统的效率和通用性。
The security system uses XML files to store and recreate the code group hierarchy for each policy level.
安全性系统使用 XML 档来储存和重新建立各个原则层级的 程式码群组阶层架构。
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