Meta Data attribute group to be used for all messages sent and received over external interfaces. The contents and use of this data will be under continual development. Attribute indicating the name of the source of the message. Timestamp that the message was received for input messages, sent for output messages. Identification of a specific interface the message was received over. Can be used to provide extended identification to attribute msgSource. Free text attribute for any remarks that we may want add to the log. To be used primarily during development and implementation. Unique identifier for this message.