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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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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How to realize dynamic access control based on state through the collaboration among role-flow, control-flow, time-flow and action-flow is analyzed in particular.

重点分析了如何通过角色流、控制流、时间流和动作流的相互配合来实现基于状态的动态访问控制。

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