enum IfcDerivedUnitEnum { kIfcDerivedUnitEnum_ANGULARVELOCITYUNIT, 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_MOMENTORINERTIAUNIT, kIfcDerivedUnitEnum_LINEARMOMENTUNIT, kIfcDerivedUnitEnum_LINEARFORCEUNIT, kIfcDerivedUnitEnum_PLANARFORCEUNIT, kIfcDerivedUnitEnum_MODULUSOFELASTICITYUNIT, kIfcDerivedUnitEnum_SHEARMODULUSUNIT, kIfcDerivedUnitEnum_LINEARSTIFFNESSUNIT, kIfcDerivedUnitEnum_ROTATIONALSTIFFNESSUNIT, kIfcDerivedUnitEnum_MODULUSOFSUBGRADEREACTIONUNIT, kIfcDerivedUnitEnum_ACCELERATIONUNIT, kIfcDerivedUnitEnum_USERDEFINED, kIfcDerivedUnitEnum_unset };