CTM1 map files created from OpenStreetMap data (OSM files in XML format) use the attribute Type. This 32-bit value contains a value in its upper 15 bits that encodes a three-letter tag that is a mnemonic for one of the tags used in the OSM file. The encoding is done like this: for the purpose of explanation here is a C macro that takes three lower-case letters:
#define OsmType(A,B,C) ((((A)-'a') << 27) | (((B)-'a') << 22) | (((C)-'a') << 17))
However, you don't have to work with the actual numeric values because you can use the three-letter tag on the right hand side of a test in a condition.
Here are the OpenStreetMap types that are currently defined and used by generate_map_data_type1.
EAbandoned = OsmType('a','b','a'),
EAerodrome = OsmType('a','e','r'),
EAirfield = OsmType('a','i','r'),
EAirportGate = OsmType('a','g','t'),
EAirportHoldingPosition = OsmType('a','h','p'),
EAllotments = OsmType('a','l','l'),
EAlpineHut = OsmType('a','l','p'),
EAmbulanceStation = OsmType('a','m','b'),
EApron = OsmType('a','p','r'),
EAerialWayPylon = OsmType('a','p','y'),
EArtwork = OsmType('a','r','t'),
EAerialWayStation = OsmType('a','s','t'),
EAirTerminal = OsmType('a','t','e'),
EAtm = OsmType('a','t','m'),
EAttraction = OsmType('a','t','t'),
EBabyHatch = OsmType('b','a','b'),
EBarracks = OsmType('b','a','r'),
EBasin = OsmType('b','a','s'),
EBay = OsmType('b','a','y'),
EBeach = OsmType('b','e','a'),
EBeacon = OsmType('b','e','c'),
EBedAndBreakfast = OsmType('b','e','d'),
EBench = OsmType('b','e','n'),
EBank = OsmType('b','n','k'),
EBoatyard = OsmType('b','o','a'),
EBoundary = OsmType('b','o','u'),
EBorough = OsmType('b','o','r'),
EBicycleParking = OsmType('b', 'p', 'k'),
EBicycleRental = OsmType('b', 'r', 'e'),
EBridleway = OsmType('b','r','i'),
EBrownField = OsmType('b','r','o'),
EBusStop = OsmType('b','s','p'),
EBusStation = OsmType('b','s','t'),
EBufferStop = OsmType('b','u','f'),
EBuilding = OsmType('b','u','i'),
EBunker = OsmType('b','u','n'),
ECabin = OsmType('c','a','b'),
ECafe = OsmType('c','a','f'),
ECampSite = OsmType('c','a','m'),
ECanal = OsmType('c','a','n'),
ECaveEntrance = OsmType('c','a','v'),
ECableCar = OsmType('c','c','r'),
ECableDistributionCabinet = OsmType('c','d','c'),
ECemetery = OsmType('c','e','m'),
EChairLift = OsmType('c','h','a'),
ECheckPoint = OsmType('c','h','e'),
EChalet = OsmType('c','h','l'),
ECivilBoundary = OsmType('c','i','b'),
ECinema = OsmType('c','i','n'),
ECity = OsmType('c','i','t'),
ECliff = OsmType('c','l','f'),
EClinic = OsmType('c','l','i'),
ECommercial = OsmType('c','m','r'),
ECoastline = OsmType('c','o','a'),
ECollege = OsmType('c','o','l'),
ECommon = OsmType('c','o','m'),
EConstruction = OsmType('c','n','s'),
EConservation = OsmType('c','n','v'),
EContinent = OsmType('c','o','n'),
ECounty = OsmType('c','o','u'),
ECarPark = OsmType('c','p','k'),
ECarRental = OsmType('c','r','e'),
ECrossing = OsmType('c','r','o'),
ECountry = OsmType('c','r','y'),
ECarSharing = OsmType('c','s','h'),
ECarWash = OsmType('c','w','a'),
ECaravanSite = OsmType('c','v','n'),
ECycleway = OsmType('c','y','c'),
EDam = OsmType('d','a','m'),
EDangerArea = OsmType('d','a','n'),
EDentist = OsmType('d','e','n'),
EDisused = OsmType('d','i','s'),
EDitch = OsmType('d','i','t'),
EDock = OsmType('d','o','c'),
EDrain = OsmType('d','r','a'),
EDragLift = OsmType('d','r','g'),
EDoctors = OsmType('d','r','s'),
EDistrict = OsmType('d','s','t'),
EElectricVehicleCharging = OsmType('e','v','c'),
EFarm = OsmType('f','a','r'),
EFarmYard = OsmType('f','a','y'),
EFell = OsmType('f','e','l'),
EFerryTerminal = OsmType('f','e','t'),
EFastFood = OsmType('f','f','d'),
EFireExtinguisher = OsmType('f','i','e'),
EFireFlapper = OsmType('f','i','f'),
EFireHose = OsmType('f','i','h'),
EFireStation = OsmType('f','i','s'),
EFireHydrant = OsmType('f','i','y'),
EFootpath = OsmType('f','o','o'),
EForestry = OsmType('f','o','r'),
EFuel = OsmType('f','u','e'),
EFunicular = OsmType('f','u','n'),
EGarages = OsmType('g','a','r'),
EGate = OsmType('g','a','t'),
EGarden = OsmType('g','d','n'),
EGenerator = OsmType('g','e','n'),
EGreenHouse = OsmType('g','h','o'),
EGlacier = OsmType('g','l','a'),
EGolfCourse = OsmType('g','o','l'),
EGondola = OsmType('g','o','n'),
EGoodsAerialWay = OsmType('g','o','o'),
EGrass = OsmType('g','r','a'),
EGreenField = OsmType('g','r','e'),
EGritBin = OsmType('g','r','b'),
EGraveYard = OsmType('g','r','y'),
EGuestHouse = OsmType('g','u','e'),
EHalt = OsmType('h','a','l'),
EHamlet = OsmType('h','a','m'),
EHangar = OsmType('h','a','n'),
EHeath = OsmType('h','e','a'),
EHelipad = OsmType('h','e','l'),
ERailwayHalt = OsmType('h','l','t'),
EHospital = OsmType('h','o','s'),
EHotel = OsmType('h','o','t'),
EHostel = OsmType('h','s','t'),
EIndustrial = OsmType('i','n','d'),
EInformation = OsmType('i','n','f'),
EIsland = OsmType('i','s','l'),
EIsolatedDwelling = OsmType('i','s','o'),
EKindergarten = OsmType('k','i','n'),
ELandFill = OsmType('l','a','n'),
ELand = OsmType('l','n','d'),
ELevelCrossing = OsmType('l','e','v'),
ELibrary = OsmType('l','i','b'),
ELightRail = OsmType('l','i','r'),
ELocality = OsmType('l','o','c'),
ELockGate = OsmType('l','o','k'),
EMaritimeBoundary = OsmType('m','a','b'),
EMall = OsmType('m','a','l'),
EMarsh = OsmType('m','a','r'),
EMeadow = OsmType('m','e','a'),
EMilitary = OsmType('m','i','l'),
EMixedAerialWay = OsmType('m','i','x'),
EMonorail = OsmType('m','o','n'),
EMotel = OsmType('m','o','t'),
EMinorPowerLine = OsmType('m','p','l'),
EMiniatureRailway = OsmType('m','r','y'),
EMud = OsmType('m','u','d'),
EMunicipality = OsmType('m','u','n'),
EMuseum = OsmType('m','u','s'),
ENarrowGauge = OsmType('n','a','r'),
ENatureReserve = OsmType('n','a','t'),
ENavalBase = OsmType('n','a','v'),
ENationalParkBoundary = OsmType('n','p','b'),
ENeighborhood = OsmType('n','e','i'),
ENursingHome = OsmType('n','u','r'),
EOrchard = OsmType('o','r','c'),
EPrecisionApproachPathIndicator = OsmType('p','a','p'),
EPark = OsmType('p','a','r'),
EPublicBuilding = OsmType('p','b','u'),
EPostBox = OsmType('p','b','x'),
EPeak = OsmType('p','e','a'),
EPharmacy = OsmType('p','h','a'),
EPhone = OsmType('p','h','o'),
EPicnicSite = OsmType('p','i','c'),
EParkingEntrance = OsmType('p','k','e'),
EParking = OsmType('p','k','g'),
EParkingSpace = OsmType('p','k','s'),
EPlantNursery = OsmType('p','l','a'),
EPlatform = OsmType('p','l','f'),
EPlaceOfWorship = OsmType('p','l','w'),
EPlayground = OsmType('p','l','y'),
EPoliticalBoundary = OsmType('p','o','b'),
EPostOffice = OsmType('p','o','f'),
EPolice = OsmType('p','o','l'),
EProtectedArea = OsmType('p','r','a'),
EPreservedRailway = OsmType('p','r','y'),
EPowerSubStation = OsmType('p','s','s'),
EPub = OsmType('p','u','b'),
EPowerLine = OsmType('p','w','l'),
EPowerStation = OsmType('p','w','s'),
EQuarry = OsmType('q','a','r'),
ERail = OsmType('r','a','i'),
ERange = OsmType('r','a','n'),
ERapids = OsmType('r','a','p'),
ERecycling = OsmType('r','c','y'),
ERecreationGround = OsmType('r','e','c'),
ERegion = OsmType('r','e','g'),
ERetail = OsmType('r','e','t'),
ERiver = OsmType('r','i','v'),
ERailway = OsmType('r','l','y'),
ERoundHouse = OsmType('r','o','u'),
EResidential = OsmType('r','s','d'),
ERestaurant = OsmType('r','s','t'),
EReservoir = OsmType('r','s','v'),
ERunway = OsmType('r','u','n'),
ERiverBank = OsmType('r','v','b'),
ESaltPond = OsmType('s','a','l'),
ESand = OsmType('s','a','n'),
ESchool = OsmType('s','c','h'),
EScree = OsmType('s','c','r'),
EScrub = OsmType('s','c','b'),
ESea = OsmType('s','e','a'),
EStateEmergencyServiceStation = OsmType('s','e','s'),
ESportsCenter = OsmType('s','p','o'),
ESportsPitch = OsmType('s','p','p'),
ESpring = OsmType('s','p','r'),
ESportsTrack = OsmType('s','p','t'),
EState = OsmType('s','t','a'),
ESteps = OsmType('s','t','e'),
EStadium = OsmType('s','t','m'),
ERailwayStation = OsmType('s','t','n'),
EStation = OsmType('s','t','n'), // deliberate duplicate
EStone = OsmType('s','t','o'),
EStopPosition = OsmType('s','t','p'),
EStream = OsmType('s','t','r'),
ESuburb = OsmType('s','u','b'),
ESubwayEntrance = OsmType('s','w','e'),
ESwimmingPool = OsmType('s','w','i'),
ESubway = OsmType('s','w','y'),
ETaxi = OsmType('t','a','x'),
ETheatre = OsmType('t','h','e'),
EThemePark = OsmType('t','h','p'),
EToilet = OsmType('t','o','i'),
ETown = OsmType('t','o','w'),
ETurningCircle = OsmType('t','c','i'),
ETurningPoint = OsmType('t','p','t'),
ETram = OsmType('t','r','a'),
ETree = OsmType('t','r','e'),
ETrafficSignals = OsmType('t','r','f'),
ETramStop = OsmType('t','r','s'),
ETurnTable = OsmType('t','u','r'),
ETower = OsmType('t','w','r'),
ETaxiway = OsmType('t','w','y'),
EUniversity = OsmType('u','n','i'),
EVisualApproachSlopeIndicator = OsmType('v','a','s'),
EVillageGreen = OsmType('v','i','g'),
EVillage = OsmType('v','i','l'),
EVineyard = OsmType('v','i','n'),
EViewPoint = OsmType('v','i','w'),
EVolcano = OsmType('v','o','l'),
EWater = OsmType('w','a','t'),
EWeir = OsmType('w','e','r'),
EWetland = OsmType('w','e','t'),
EWindsock = OsmType('w','i','s'),
EWood = OsmType('w','o','o'),
EZoo = OsmType('z','o','o')
