Abstract
Analysis constraints and its diversity in security access control model. Cardinality is a common constraint in access control model. An extended cardinality constraint access control model is established. According to actual demand, we describe the user-role, user-session, role-session cardinality constraints based on the RBAC model. The differences between static and dynamic cardinality constraints are also represented particularly. Describe the extended model with Schema based XML and extend corresponding model functional specification. In order to support the extended model, we give an implementation structure including access control management and query functions.
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