tag = 'UNT'
Eancom.register_segment(tag: tag, klass: Eancom::Edifact::UNT)

structure = Eancom::Edifact::Structure.new(tag: tag)
#==============================================================================
# Tag                                                                         #
#==============================================================================
tag = Eancom::Edifact::Composite.new()
data = Eancom::Edifact::Data.new(
  type: String,
  length: 1..3,
  dictionary: nil,
  description: "Message Header",
  required: true
)
tag.add(:tag, data)

structure << tag
#==============================================================================
# Number of segments in the message                                           #
#==============================================================================
number_of_segments_in_message = Eancom::Edifact::Composite.new()
data = Eancom::Edifact::Data.new(
  type: String,
  length: 1..10,
  dictionary: nil,
  description: "Number of segments in the message",
  required: true
)
number_of_segments_in_message.add(:number_of_segments_in_message, data)

structure << number_of_segments_in_message
#==============================================================================
# Message reference number                                                    #
#==============================================================================
message_reference_number = Eancom::Edifact::Composite.new()
data = Eancom::Edifact::Data.new(
  type: String,
  length: 1..14,
  dictionary: nil,
  description: "Message reference number",
  required: true
)
message_reference_number.add(:message_reference_number, data)

structure << message_reference_number
#==============================================================================
Eancom.register_structure(tag: 'UNT', structure: structure)