multi-granularity_time_constraints

1.This model extends the traditional RBAC model with user credentials, temporal constraints and XML document classification to enforce a content-based time-aware multi-granularity access control.
该模型从用户证书、时间约束、XML文档分类等方面对传统的RBAC模型进行了扩展，以实现基于内容的时间上下文敏感的多粒度访问控制。
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