the body shall contains one and only one of these elements  : SubscribeResponse, ResourceUnknownFault, InvalidFilterFault, TopicExpressionDialectUnknownFault, InvalidTopicExpressionFault, TopicNotSupportedFault, InvalidProducerPropertiesExpressionFault, InvalidMessageContentExpressionFault, UnrecognizedPolicyRequestFault, UnsupportedPolicyRequestFault, NotifyMessageNotSupportedFault, UnacceptableInitialTerminationTimeFault, SubscribeCreationFailedFault (wsn-ws_base_notification-1.3-spec-os, 4.2)