Static possibleFields
possibleFields: string[] = ["sessionId","subscriptionId","priority","publishingInterval","maxKeepAliveCount","maxLifetimeCount","maxNotificationsPerPublish","publishingEnabled","modifyCount","enableCount","disableCount","republishRequestCount","republishMessageRequestCount","republishMessageCount","transferRequestCount","transferredToAltClientCount","transferredToSameClientCount","publishRequestCount","dataChangeNotificationsCount","eventNotificationsCount","notificationsCount","latePublishRequestCount","currentKeepAliveCount","currentLifetimeCount","unacknowledgedMessageCount","discardedMessageCount","monitoredItemCount","disabledMonitoredItemCount","monitoringQueueOverflowCount","nextSequenceNumber","eventQueueOverFlowCount"]