Read
Modify
Create (Add)
Link
Copy (Copy is not the same of Link)
Grant (??? for group member?)

Owner (Adminstrator)
Group (Shall it be specified by its' group name?)
Anonymous (Public)

Hierarchy style: Min/Max
Node style: EndPoint | StartPoint
IsCacheExpired: true/false (When new ancestor be added false will be set and cache right is no longer valid.)
Cache right:6bit