The permission propagation constraint improves the access control grain. It makes the grain reach element or attribute level.
权限传递约束提高了访问控制的粒度，使得访问控制的粒度能够达到元素或属性级。
Authorization constraint is an important part in role-based access control models.
授权约束是基于角色的访问控制模型中一个非常重要的部分。
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。
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。
Draw TRBAC who haves time constraint control pattern, and uniting the practice put up the system access control based on characters.
引入含有时间约束的TRBAC控制模型，结合实践构筑了系统的基于角色的访问控制。
Draw TRBAC who haves time constraint control pattern, and uniting the practice put up the system access control based on characters.
引入含有时间约束的TRBAC控制模型，结合实践构筑了系统的基于角色的访问控制。
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