||(Sequence number) -- three-byte character.
Used for sequence validation of multi-block messages. Always '001' for a single block
||(Message Count) -- five-byte character. The
character number total from MSG ID to the end of message. Includes all delimiters. Note
the segment delimiters and the end of message take two bytes in ALC equivalent.
||(Message ID) -- fourteen-byte alphanumeric.
Delimits the name or ID of the message.
||(Version) -- two-byte alphanumeric. Current
version of the MSG ID in the host application.
||(Segment Name) -- six-byte alphanumeric. A
segment is a grouping of elements. The segment name appears for the start of every
||(Nesting Level) -- one-byte numeric. Level of
sub-grouping of elements within a segment. Appears after the segment name and has a
maximum value of nine.
||(Data Element) -- Variable or fixed length
alphanumeric or special character. Basic unit of application data.
||(Repeating Data Element) -- Variable or fixed
length alphanumeric or special character. Can repeat within a segment. The repeating
element delimiter delimits the last repeating element.