This closed model allows Velocity to provide a decoupled templating presentation layer, cleanly separated from any application business logic or data management code.
这种封闭的模型使Velocity能够提供分离的模板表示层，与任何应用程序业务逻辑或者数据管理代码清晰地划分开。
Role is separated from authority layer, bring whole model getting simple and easy in system design and flexibility in security controlling, this is the most outstanding characteristic of RBAC model;
角色和权限逐层分离，带来整个模型系统设计的简易性和安全控制的灵活性，这是RBAC 模型最突出的特点；
Role is separated from authority layer, bring whole model getting simple and easy in system design and flexibility in security controlling, this is the most outstanding characteristic of RBAC model;
角色和权限逐层分离，带来整个模型系统设计的简易性和安全控制的灵活性，这是RBAC 模型最突出的特点；
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