1. A computer program product embodied on a non-transitory computer readable medium for facilitating communication, comprising: at least one directory containing policy data for a plurality of network entities stored therein; computer code for controlling at least one computer device and operable to receive a message; wherein the computer program product is operable such that each of the plurality of network entities contains policy data corresponding thereto for governing interaction with at least one of the network entities utilizing an interoperability network; wherein the computer program product is operable such that at least one of policy data of a first one of the network entities and policy data of a second one of the network entities is used for authorization; and computer code for merging the policy data of the first entity and the policy data of the second entity to produce a combined policy that is honored by both of the first entity and the second entity.