而基于角色的访问控制模型以角色为中介，将用户与权限逻辑隔离，但该模型不能处理有执行顺序的任务；
Role is introduced to separate user and privilege in role-based access control model, but RBAC can't directly control the permission for a sequence of events.
在对文档进行分类的基础上，定义了一种双角色的基于角色的访问控制模型，并给出了此模型的数据流图及部分以XACML形式表示的控制策略。
Based on the classifying of the protected documents, a DR-RBAC model is defined, and its data-flow diagram and two examples of PolicySets expressed by XACML are given out.
基于角色的访问控制模型(RBAC)难以直接有效地应用到以“最小需要”为原则的细粒度访问控制应用领域。
The basic model of RBAC can not be applied directly to the systems which require "minimum necessary" and fine-grained access control.
本文以海鼎多业态商业自动化系统(HDPOS5)为例，将改进的基于岗位与角色的访问控制模型应用到该系统中，更好的保证了系统的安全性。
This paper takes heading multiple area automatic commerce system (HDPOS5) for example, applied the improved base on position and role access control model to system, ensure the security of the system.
本文以海鼎多业态商业自动化系统(HDPOS5)为例，将改进的基于岗位与角色的访问控制模型应用到该系统中，更好的保证了系统的安全性。
This paper takes heading multiple area automatic commerce system (HDPOS5) for example, applied the improved base on position and role access control model to system, ensure the security of the system.
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