This paper chooses and realizes the privilege system role-based based on the further research between discretionary access control, mandatory access control and role-based access control.

论文在对自主访问控制、强制访问控制和基于角色的访问控制的访问控制策略及机制分析、研究基础上，选择并实现了基于角色的权限管理系统。

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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.

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。

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Before 1970, in order to protect the information security in computer systems, mandatory and discretionary access control policy had been widely applied in secure computer systems.

在上世纪七十年代以前，为保证计算机系统中的信息安全性，自主存取控制和强制存取控制策略在计算机多安全级系统中得到了广泛的应用。

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Saving money through an amended sequester should not be an excuse for continuing wasteful domestic or military programs, discretionary or mandatory.

WSJ: Paul Light: The Sequester Is an Overhaul Opportunity

Conrad explained that Senate appropriators consider the conversion of a discretionary program to a mandatory one to be a usurpation of their power by the executive branch.

NEWYORKER: Money Talks

If customers like Pastor Bell routinely ignore service charges (which, so far as the IRS is concerned is mandatory and not discretionary), lower revenues could translate to lower wages for servers.

FORBES: Pastor Who Refused To Pay Applebee's Service Charge Becomes Unwitting Poster Child For Server Pay And Tax Issues