Constraint Hierarchical RBAC 带约束的RBAC
RBAC is rather difficult to assign permissions to roles reasonably and is unable to express constraint in complicated workflow access control.
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。
Role authorization constraint is one of focal points of RBAC research.
角色授权约束是RBAC研究的重要内容。
The traditional RBAC model cannot express complicated workflow secure access control constraint.
传统的RBAC访问控制模型已经不能表达复杂的工作流安全访问控制约束。
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