16. The method according to claim 14 , wherein the requesting entity accesses said machine-readable service description by subscribing to a service information notification service provided by the registry, service information comprising availability of at least one service and at least one corresponding machine-readable service description.
16. The method according to claim 14 , wherein the requesting entity accesses said machine-readable service description by subscribing to a service information notification service provided by the registry, service information comprising availability of at least one service and at least one corresponding machine-readable service description. 17. The method according to claim 16 , wherein the step of subscribing to a service information notification service comprises the step of inserting filtering conditions.