{
"ISA" => :interchange_control_header,
"IEA" => :interchange_control_trailer,
"GS" => :functional_group_header,
"GE" => :functional_group_trailer,
"ST" => :transaction_set_header,
"SE" => :transaction_set_trailer,
"LS" => :loop_header,
"LE" => :loop_trailer,
"BHT" => :begin_hierarchial_transaction,
"HL" => :hierarchial_level,
"NM1" => :individual_or_organization_name,
"N3" => :party_location,
"N4" => :geographic_location,
"PER" => :administrative_communications_contact,
"TRN" => :trace,
"MSG" => :message_text,
"DMG" => :demographic_information,
"REF" => :reference_information,
"DTP" => :date_time_period,
"EQ" => :eligibility_or_benefit_inquiry,
"EB" => :eligibility_or_benefit_information,
"AAA" => :request_validation,
"AK1" => :functional_group_response_header,
"AK9" => :functional_group_response_trailer,
"AK2" => :transaction_set_response_header,
"IK3" => :implementation_data_segment_note,
"IK4" => :implementation_data_element_note,
"IK5" => :implementation_transaction_set_response_trailer,
}