http://www.customs.gov/linkhandler/cgov/travel/inspections_carriers_facilities/apis/unedifact_guide/un_edifact_guide.ctt/un_edifact_guide.pdf
http://www.customs.gov/linkhandler/cgov/travel/inspections_carriers_facilities/apis/unedifact_guide/un_edifact_guide.ctt/un_edifact_guide.pdf