#### 8.9.2.39 IfcValue

IfcValue is a select type for selecting between more specialised select types IfcSimpleValue, IfcMeasureValue and IfcDerivedMeasureValue.

SELECT

- IfcSimpleValue A select type for basic defined types of simple data type.
- IfcMeasureValue A select type for basic measure types of ISO 10303-41.
- IfcDerivedMeasureValue A select type for derived measure types.

> HISTORY New type in IFC2x.

XSD Specification:

<xs:group name="IfcValue">
<xs:choice>
<xs:element ref="ifc:IfcAreaMeasure-wrapper"/>
<xs:element ref="ifc:IfcBoolean-wrapper"/>
<xs:element ref="ifc:IfcCountMeasure-wrapper"/>
<xs:element ref="ifc:IfcDate-wrapper"/>
<xs:element ref="ifc:IfcDateTime-wrapper"/>
<xs:element ref="ifc:IfcDuration-wrapper"/>
<xs:element ref="ifc:IfcElectricConductanceMeasure-wrapper"/>
<xs:element ref="ifc:IfcElectricCurrentMeasure-wrapper"/>
<xs:element ref="ifc:IfcElectricVoltageMeasure-wrapper"/>
<xs:element ref="ifc:IfcForceMeasure-wrapper"/>
<xs:element ref="ifc:IfcIdentifier-wrapper"/>
<xs:element ref="ifc:IfcIlluminanceMeasure-wrapper"/>
<xs:element ref="ifc:IfcInteger-wrapper"/>
<xs:element ref="ifc:IfcIonConcentrationMeasure-wrapper"/>
<xs:element ref="ifc:IfcLabel-wrapper"/>
<xs:element ref="ifc:IfcLengthMeasure-wrapper"/>
<xs:element ref="ifc:IfcLinearVelocityMeasure-wrapper"/>
<xs:element ref="ifc:IfcLogical-wrapper"/>
<xs:element ref="ifc:IfcMassMeasure-wrapper"/>
<xs:element ref="ifc:IfcNormalisedRatioMeasure-wrapper"/>
<xs:element ref="ifc:IfcPHMeasure-wrapper"/>
<xs:element ref="ifc:IfcPlaneAngleMeasure-wrapper"/>
<xs:element ref="ifc:IfcPositiveLengthMeasure-wrapper"/>
<xs:element ref="ifc:IfcPositiveRatioMeasure-wrapper"/>
<xs:element ref="ifc:IfcPowerMeasure-wrapper"/>
<xs:element ref="ifc:IfcPressureMeasure-wrapper"/>
<xs:element ref="ifc:IfcRadioActivityMeasure-wrapper"/>
<xs:element ref="ifc:IfcRatioMeasure-wrapper"/>
<xs:element ref="ifc:IfcReal-wrapper"/>
<xs:element ref="ifc:IfcSoundPressureMeasure-wrapper"/>
<xs:element ref="ifc:IfcTemperatureRateOfChangeMeasure-wrapper"/>
<xs:element ref="ifc:IfcText-wrapper"/>
<xs:element ref="ifc:IfcThermalConductivityMeasure-wrapper"/>
<xs:element ref="ifc:IfcThermodynamicTemperatureMeasure-wrapper"/>
<xs:element ref="ifc:IfcTime-wrapper"/>
<xs:element ref="ifc:IfcTimeMeasure-wrapper"/>
<xs:element ref="ifc:IfcTimeStamp-wrapper"/>
<xs:element ref="ifc:IfcTorqueMeasure-wrapper"/>
<xs:element ref="ifc:IfcVolumetricFlowRateMeasure-wrapper"/>
</xs:choice>
</xs:group>

EXPRESS Specification:

TYPE IfcValue = SELECT (
END_TYPE;

EXPRESS-G diagram

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