ENUM
enum TravelDocumentType {PASSPORTVISAID_CARDDRIVING_LICENCEALIEN_CARDRESIDENCE_CARDFACILITATION_DOCUMENTMILITARY_CARDNEXUS_CARDREFUGEE_DOCUMENTIRPA_EXEMPTNATURALISATION_CERTIFICATECHINA_HOME_RETURN_PERMITTAIWAN_MAINLAND_PERMITSAR_HONG_KONG_PASSSAR_MACAU_PASSUN_PASSPORTGUN_PERMITOTHERCREW_MEMBER_CARDCHINA_HOME_RETURN_PERMIT_FOR_HK_MO_RESIDENTSTAIWAN_ENTRY_PERMIT_FOR_MAINLAND_CHINESEMAINLAND_TRAVEL_PERMIT_FOR_TAIWAN_RESIDENTSREDRESS}