8.11.2.15 IfcDerivedUnitEnum（导出单位枚举）
8.11.2.15.1 语义定义（Semantic definition）
IfcDerivedUnitEnum 是一个用于定义导出单位允许类型的枚举类型。
IFC 2x4变更：增加了AREADENSITYUNIT、SOUNDPOWERLEVELUNIT、SOUNDPRESSURELEVELUNIT和TEMPERATURERATEOFCHANGEUNIT。
8.11.2.15.2 类型值
| 类型 | 描述 |
|---|---|
ACCELERATIONUNIT
| |
ANGULARVELOCITYUNIT
| |
AREADENSITYUNIT
| |
COMPOUNDPLANEANGLEUNIT
| |
CURVATUREUNIT
| |
DYNAMICVISCOSITYUNIT
| |
HEATFLUXDENSITYUNIT
| |
HEATINGVALUEUNIT
| |
INTEGERCOUNTRATEUNIT
| |
IONCONCENTRATIONUNIT
| |
ISOTHERMALMOISTURECAPACITYUNIT
| |
KINEMATICVISCOSITYUNIT
| |
LINEARFORCEUNIT
| |
LINEARMOMENTUNIT
| |
LINEARSTIFFNESSUNIT
| |
LINEARVELOCITYUNIT
| |
LUMINOUSINTENSITYDISTRIBUTIONUNIT
| |
MASSDENSITYUNIT
| |
MASSFLOWRATEUNIT
| |
MASSPERLENGTHUNIT
| |
MODULUSOFELASTICITYUNIT
| |
MODULUSOFLINEARSUBGRADEREACTIONUNIT
| |
MODULUSOFROTATIONALSUBGRADEREACTIONUNIT
| |
MODULUSOFSUBGRADEREACTIONUNIT
| |
MOISTUREDIFFUSIVITYUNIT
| |
MOLECULARWEIGHTUNIT
| |
MOMENTOFINERTIAUNIT
| |
PHUNIT
| |
PLANARFORCEUNIT
| |
ROTATIONALFREQUENCYUNIT
| |
ROTATIONALMASSUNIT
| |
ROTATIONALSTIFFNESSUNIT
| |
SECTIONAREAINTEGRALUNIT
| |
SECTIONMODULUSUNIT
| |
SHEARMODULUSUNIT
| |
SOUNDPOWERLEVELUNIT
| |
SOUNDPOWERUNIT
| |
SOUNDPRESSURELEVELUNIT
| |
SOUNDPRESSUREUNIT
| |
SPECIFICHEATCAPACITYUNIT
| |
TEMPERATUREGRADIENTUNIT
| |
TEMPERATURERATEOFCHANGEUNIT
| |
THERMALADMITTANCEUNIT
| |
THERMALCONDUCTANCEUNIT
| |
THERMALEXPANSIONCOEFFICIENTUNIT
| |
THERMALRESISTANCEUNIT
| |
THERMALTRANSMITTANCEUNIT
| |
TORQUEUNIT
| |
VAPORPERMEABILITYUNIT
| |
VOLUMETRICFLOWRATEUNIT
| |
WARPINGCONSTANTUNIT
| |
WARPINGMOMENTUNIT
| |
USERDEFINED
|
8.11.2.15.3 形式化表示（Formal representation）
TYPE IfcDerivedUnitEnum = ENUMERATION OF
(ACCELERATIONUNIT
,ANGULARVELOCITYUNIT
,AREADENSITYUNIT
,COMPOUNDPLANEANGLEUNIT
,CURVATUREUNIT
,DYNAMICVISCOSITYUNIT
,HEATFLUXDENSITYUNIT
,HEATINGVALUEUNIT
,INTEGERCOUNTRATEUNIT
,IONCONCENTRATIONUNIT
,ISOTHERMALMOISTURECAPACITYUNIT
,KINEMATICVISCOSITYUNIT
,LINEARFORCEUNIT
,LINEARMOMENTUNIT
,LINEARSTIFFNESSUNIT
,LINEARVELOCITYUNIT
,LUMINOUSINTENSITYDISTRIBUTIONUNIT
,MASSDENSITYUNIT
,MASSFLOWRATEUNIT
,MASSPERLENGTHUNIT
,MODULUSOFELASTICITYUNIT
,MODULUSOFLINEARSUBGRADEREACTIONUNIT
,MODULUSOFROTATIONALSUBGRADEREACTIONUNIT
,MODULUSOFSUBGRADEREACTIONUNIT
,MOISTUREDIFFUSIVITYUNIT
,MOLECULARWEIGHTUNIT
,MOMENTOFINERTIAUNIT
,PHUNIT
,PLANARFORCEUNIT
,ROTATIONALFREQUENCYUNIT
,ROTATIONALMASSUNIT
,ROTATIONALSTIFFNESSUNIT
,SECTIONAREAINTEGRALUNIT
,SECTIONMODULUSUNIT
,SHEARMODULUSUNIT
,SOUNDPOWERLEVELUNIT
,SOUNDPOWERUNIT
,SOUNDPRESSURELEVELUNIT
,SOUNDPRESSUREUNIT
,SPECIFICHEATCAPACITYUNIT
,TEMPERATUREGRADIENTUNIT
,TEMPERATURERATEOFCHANGEUNIT
,THERMALADMITTANCEUNIT
,THERMALCONDUCTANCEUNIT
,THERMALEXPANSIONCOEFFICIENTUNIT
,THERMALRESISTANCEUNIT
,THERMALTRANSMITTANCEUNIT
,TORQUEUNIT
,VAPORPERMEABILITYUNIT
,VOLUMETRICFLOWRATEUNIT
,WARPINGCONSTANTUNIT
,WARPINGMOMENTUNIT
,USERDEFINED);
END_TYPE;