layer-separated model 层次分离模型
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；
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