权限模型：权限模型允许对系统中的任何内容应用用户角色。
Permissions model: the permissions model allows user roles to be applied to any in the system.
不管应用程序的访问控制基于密码还是基于角色，您都需要一个登录和注销系统来处理用户身份验证。
Regardless of whether your application's access control will be based on passwords or roles, you'll still need a login and logout system to handle user authentication.
应用系统可能包含协调者的角色，在某种程度上它变得越来越不清晰，为什么协议的必要性要远大于业务逻辑本身？
the application may subsume the role of the coordinator at which point it becomes less and less clear why the protocol is needed at all above and beyond the business logic itself.
应用推荐