Admin represents a system administrator with specific roles and permissions.

Group represents a collection of roles for simplifying permission management.

Permissions describe the rules for accessing resources.

Resource represents a protectable entity within the system.

Role represents a stable set of permissions linked to business functions.

RoleResourcePermission defines permissions for a role on a specific resource.

RoleWildCardPermission defines permissions for a role on a pattern of resources.

RWXD specifies a set of permissions for resources.