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

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
#==============================================================================
# DOCUMENT/MESSAGE NAME                                                       #
#==============================================================================
document_name_code = Eancom::Edifact::Composite.new

data = Eancom::Edifact::Data.new(
  type: String,
  length: 1..3,
  dictionary: {
    '270' => {
      description: 'Delivery note'
    },
    '381' => {
      description: 'Credit note - goods and services'
    },
    '71E' => {
      description: 'Instruction for returns (GS1 Temporary Code)'
    }
  },
  description: 'Document name code',
  required: false
)
document_name_code.add(:document_name_code, data)

structure << document_name_code
#==============================================================================
Eancom.register_structure(tag: 'DOC', structure: structure)