Root identity of message type Version number of the message type System sending the message System receiving the message Date and Time that message was issued from sending system Free format text about the message 1 - Important, 2 - Medium, 3 - low Unique identifier for (a set of) message(s) Sequence of message on a set of messages. Number of messages in a set of messages. Indicates the total number of messages within a message set. User id of individual submitting the message Used in a response message to indicate the original message being responded to Identity of the message type of the original message being responded to Unique identifier for (a set of) message(s) of the original message being responded to. Sequence of message on a set of messages of the original message being responded to. D - Delta message, F - Full Message Number of records in body of message Unique identifier for (a set of) message(s) The unique identifier of the item defined in the Serialization context filed Sequencer assigning unique message number (within a message type, Serialization context, Object number) D - Delete Record, I - Insert Record, U - Update Record