UN/EDIFACT Syntax Version 4 Message List

AUTACK	Secure authentication and acknowledgement message
CONTRL	Syntax and service report message for batch EDI
KEYMAN	Security key and certificate management message

Change indicators
plus sign		An addition.
asterisk		Addition/substraction/change to a code entry for a particular data element.
hash or pound sign		Changes to names.
vertical bar		Changes to text for descriptions, notes and functions.
minus sign		A deletion.
letter X		Marked for deletion.