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授权约束是基于角色的访问控制模型中一个非常重要的部分。
Authorization constraint is an important part in role-based access control models.
完善的安全体系，采用灵活的基于角色的访问控制模型，实现灵活的访问控制体系。
Perfect security system, Using flexible Role-Based Access Control model to build flexible Role-Based Access Control system.
然后，描述了几种具有代表性的基于角色的访问控制模型，并对这几种访问控制模型进行了分析比较。
Then, the paper describes several typical Role Based Access Control models, at the same time analyzes and compares them.
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