enum UnitsValue { kUnitsUndefined = 0, kUnitsInches = 1, kUnitsFeet = 2, kUnitsMiles = 3, kUnitsMillimeters = 4, kUnitsCentimeters = 5, kUnitsMeters = 6, kUnitsKilometers = 7, kUnitsMicroinches = 8, kUnitsMils = 9, kUnitsYards = 10, kUnitsAngstroms = 11, kUnitsNanometers = 12, kUnitsMicrons = 13, kUnitsDecimeters = 14, kUnitsDekameters = 15, kUnitsHectometers = 16, kUnitsGigameters = 17, kUnitsAstronomical = 18, kUnitsLightYears = 19, kUnitsParsecs = 20, kUnitsUSSurveyFeet = 21, kUnitsUSSurveyInch = 22, kUnitsUSSurveyYard = 23, kUnitsUSSurveyMile = 24, kUnitsMax = kUnitsUSSurveyMile };