The role could span all web systems in portal. It was a token-based and dynamic-activated access control model, which could dynamically adjust the access rights according to user access requirement.

该模型是一个动态激活的模型，根据用户实际的访问需求动态激活相应角色，为用户管理和访问控制管理提供了一个新的解决方案。

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Its can be used for reference by their practical application in Role-Based Access Control, especially in dynamic environment.

本文为在动态环境下应用的访问控制机制提供了有意义的参考。

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This paper proposes the role concept, discusses the dynamic access control of role-based workflow status, and describes and analyses the formal model.

本文将角色的概念加入进来，讨论了基于角色的工作流状态的动态访问控制，并对其模型进行了形式化描述和分析。

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