enum IfcDerivedUnitEnum { kIfcDerivedUnitEnum_ANGULARVELOCITYUNIT, kIfcDerivedUnitEnum_AREADENSITYUNIT, kIfcDerivedUnitEnum_COMPOUNDPLANEANGLEUNIT, kIfcDerivedUnitEnum_DYNAMICVISCOSITYUNIT, kIfcDerivedUnitEnum_HEATFLUXDENSITYUNIT, kIfcDerivedUnitEnum_INTEGERCOUNTRATEUNIT, kIfcDerivedUnitEnum_ISOTHERMALMOISTURECAPACITYUNIT, kIfcDerivedUnitEnum_KINEMATICVISCOSITYUNIT, kIfcDerivedUnitEnum_LINEARVELOCITYUNIT, kIfcDerivedUnitEnum_MASSDENSITYUNIT, kIfcDerivedUnitEnum_MASSFLOWRATEUNIT, kIfcDerivedUnitEnum_MOISTUREDIFFUSIVITYUNIT, kIfcDerivedUnitEnum_MOLECULARWEIGHTUNIT, kIfcDerivedUnitEnum_SPECIFICHEATCAPACITYUNIT, kIfcDerivedUnitEnum_THERMALADMITTANCEUNIT, kIfcDerivedUnitEnum_THERMALCONDUCTANCEUNIT, kIfcDerivedUnitEnum_THERMALRESISTANCEUNIT, kIfcDerivedUnitEnum_THERMALTRANSMITTANCEUNIT, kIfcDerivedUnitEnum_VAPORPERMEABILITYUNIT, kIfcDerivedUnitEnum_VOLUMETRICFLOWRATEUNIT, kIfcDerivedUnitEnum_ROTATIONALFREQUENCYUNIT, kIfcDerivedUnitEnum_TORQUEUNIT, kIfcDerivedUnitEnum_MOMENTOFINERTIAUNIT, kIfcDerivedUnitEnum_LINEARMOMENTUNIT, kIfcDerivedUnitEnum_LINEARFORCEUNIT, kIfcDerivedUnitEnum_PLANARFORCEUNIT, kIfcDerivedUnitEnum_MODULUSOFELASTICITYUNIT, kIfcDerivedUnitEnum_SHEARMODULUSUNIT, kIfcDerivedUnitEnum_LINEARSTIFFNESSUNIT, kIfcDerivedUnitEnum_ROTATIONALSTIFFNESSUNIT, kIfcDerivedUnitEnum_MODULUSOFSUBGRADEREACTIONUNIT, kIfcDerivedUnitEnum_ACCELERATIONUNIT, kIfcDerivedUnitEnum_CURVATUREUNIT, kIfcDerivedUnitEnum_HEATINGVALUEUNIT, kIfcDerivedUnitEnum_IONCONCENTRATIONUNIT, kIfcDerivedUnitEnum_LUMINOUSINTENSITYDISTRIBUTIONUNIT, kIfcDerivedUnitEnum_MASSPERLENGTHUNIT, kIfcDerivedUnitEnum_MODULUSOFLINEARSUBGRADEREACTIONUNIT, kIfcDerivedUnitEnum_MODULUSOFROTATIONALSUBGRADEREACTIONUNIT, kIfcDerivedUnitEnum_PHUNIT, kIfcDerivedUnitEnum_ROTATIONALMASSUNIT, kIfcDerivedUnitEnum_SECTIONAREAINTEGRALUNIT, kIfcDerivedUnitEnum_SECTIONMODULUSUNIT, kIfcDerivedUnitEnum_SOUNDPOWERLEVELUNIT, kIfcDerivedUnitEnum_SOUNDPOWERUNIT, kIfcDerivedUnitEnum_SOUNDPRESSURELEVELUNIT, kIfcDerivedUnitEnum_SOUNDPRESSUREUNIT, kIfcDerivedUnitEnum_TEMPERATUREGRADIENTUNIT, kIfcDerivedUnitEnum_TEMPERATURERATEOFCHANGEUNIT, kIfcDerivedUnitEnum_THERMALEXPANSIONCOEFFICIENTUNIT, kIfcDerivedUnitEnum_WARPINGCONSTANTUNIT, kIfcDerivedUnitEnum_WARPINGMOMENTUNIT, kIfcDerivedUnitEnum_USERDEFINED, kIfcDerivedUnitEnum_unset };