在RBAC为基础上提出了工作流访问控制模型obac。
Based on RBAC a workflow access control model-OBAC is advanced in the paper.
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.
RBAC在工作流访问控制的应用中很难合理地为角色配置权限，而且无法表达复杂的工作流访问控制约束。
RBAC is rather difficult to assign permissions to roles reasonably and is unable to express constraint in complicated workflow access control.
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