@type t() :: %HL7v2.Segment.AIG{
  allow_substitution_code: term(),
  duration: term(),
  duration_units: term(),
  extra_fields: term(),
  filler_status_code: term(),
  resource_group: term(),
  resource_id: term(),
  resource_quantity: term(),
  resource_quantity_units: term(),
  resource_type: term(),
  segment_action_code: term(),
  set_id: term(),
  start_date_time: term(),
  start_date_time_offset: term(),
  start_date_time_offset_units: term()
}