UN/EDIFACT Syntax Version 4 Segment List

	UCD	Data element error indication
	UCF	Group response
	UCI	Interchange response
	UCM	Message/package response
	UCS	Segment error indication
	UGH	Anti-collision segment group header
	UGT	Anti-collision segment group trailer
	UIB	Interactive interchange header
	UIH	Interactive message header
	UIR	Interactive status
	UIT	Interactive message trailer
	UIZ	Interactive interchange trailer
	UNA	Service String Advice
	UNB	Interchange header
	UNE	Group trailer
	UNG	Group header
	UNH	Message header
	UNO	Object header
	UNP	Object trailer
	UNS	Section control
	UNT	Message trailer
	UNZ	Interchange trailer
	USA	Security algorithm
	USB	Secured data identification
	USC	Certificate
	USD	Data encryption header
	USE	Security message relation
	USF	Key management function
	USH	Security header
	USL	Security list status
	USR	Security result
	UST	Security trailer
	USU	Data encryption trailer
	USX	Security references
	USY	Security on references

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.