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.
为了直观和准确地描述工作流访问控制，提出了一个基于图的工作流访问控制模型。
To provide a direct and precise description for workflow access control, an access control model for workflow systems was developed based on graph and graph transformation.
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