Fine Grain Access Control 细粒度访问控制
Relying parties use attributes to make fine grain access control decisions.
依赖方使用属性来更好的访问控制决策。
The policy flexibilities include controlling migrated access permissions, performing fine grain access control and revoking permitted access permission.
这些灵活性需要支持控制访问权限的转移，执行细粒度的访问控制和撤消之前许可的访问权限。
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