Methods and apparatus are described for facilitating communication among a plurality of entities via an interoperability network. Each entity has policy data corresponding thereto governing interaction with the entity via the interoperability network. A message is transmitted from a first one of the entities to a second one of the entities. The first entity has first policy data corresponding thereto and the second entity has second policy data corresponding thereto. The transmitted message was handled in the network according to combined policy data representing a combination of the first and second policy data.