stored pending a polling request from the subscriber not shown the relevance determination at 550 permits the meta web service provider to filter out change notifications that are received because of the information broker 39 s hierarchical operation but that are not of interest to the operator of the distributed data processing application in addition to the change notifications generated during the normal course of the information broker 39 s operation the meta web service provider can provide a richer set of notification primitives for example a uddi server 39 s notifications may be limited to actual changes to the database structure i e creation of new records and alteration or deletion of existing records however a web service provider may wish to communicate additional information about its services to web service consumers for example a provider may wish to discontinue a service but may not wish to inconvenience consumers by terminating the service outright the meta web service provider could extend the aggregated entities with a deprecation flag and provide a u201c deprecate u201d change notification to distribute a warning to users of the service the deprecated service might continue to be provided during a transition period to permit web service clients to adapt their distributed data processing applications to use a new service the meta web service provider can also incorporate additional information in its aggregated change notifications to assist web service consumers in identifying required application modifications and in prioritizing engineering efforts for example change notifications may include a change token as described in co pending u s patent application ser no 11 541 352 the change token may provide information about a change in a discrete machine processable form rather.