# class UPCEAN
UPCEAN inherits from OneD
# MEMBERS
# member read-only addOn
Type: String
# member read-only addOnDistanceX
Type: Number
# member read-only maxAddOnDistance
Type: Number
# FUNCTIONS
# function addOnDistance()
Description:
Return:
(ImmutableLength) -
# function guardExtra()
Description:
Return:
(ImmutableLength) -