通过用例建模，描述对系统感兴趣的外部角色及其对系统的功能要求。
By modeling use-case, UML can describe the external roles that are interested in system and the requirement of function of system.
引入了外部角色、内部角色和基本角色，使得该模型可以同时实现自主访问控制和强制访问控制，而且也方便了管理。
Introduced the outer role, inner role and basic role, the model can not only realize Discretionary Access Control but also the Mandatory Access Control. In addition, it can facilitate the management.
不过，目前捕获的信息仅仅提供了系统上下文的静态视图，通过用户、角色、通道和外部系统进行表示。
However, the information captured so far provides only a static view of the system context, represented through the users, roles, channels, and external systems.
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