20. The database system of claim 19 , wherein each said actor, a, has a capability for each of the operation selected from a group of operations comprising a read operation, a write operation, or a link operation, wherein said capability is represented as a set of keys to said resources for whom the actor seeks authorization.
20. The database system of claim 19 , wherein each said actor, a, has a capability for each of the operation selected from a group of operations comprising a read operation, a write operation, or a link operation, wherein said capability is represented as a set of keys to said resources for whom the actor seeks authorization. 21. The database system of claim 20 , wherein all resources have a policy for each operation selected from a group of operations comprising a read operation, a write operation, or a link operation, each of which said policy is represented as a function P, the value, g, of which said function P is determined depending on the actor a, on which said function P is defined; and wherein g takes a value of either True or False, and wherein a value of True grants said actor a access to said resource r, and wherein a value of False denies said actor a access to said resource r.