#### 8.3.2.4 IfcMetricValueSelect

IfcMetricValueSelect is a select type that enables selection of the data type for the value component of an IfcMetric.

Types are used as follows:

- IfcValue: A constant value using project default units.
- IfcMeasureWithUnit: A constant value using specified units.
- IfcAppliedValue: A value calculated from a formula.
- IfcTable: A value retrieved from a table.
- IfcTimeSeries: A value that varies over time.
- IfcReference: A value referenced on an object attribute.

> HISTORY New type in IFC2.0.

> IFC4 CHANGE IfcValue added, which includes removed IfcDateTime and IfcText; IfcReference added.

XSD Specification:

<xs:group name="IfcMetricValueSelect">
<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:IfcMeasureWithUnit"/>
<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:IfcReference"/>
<xs:element ref="ifc:IfcSoundPressureMeasure-wrapper"/>
<xs:element ref="ifc:IfcTable"/>
<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:IfcTimeSeries"/>
<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 IfcMetricValueSelect = SELECT (
| IfcMeasureWithUnit, IfcTable, IfcTimeSeries, IfcValue, IfcReference);
END_TYPE;

EXPRESS-G diagram

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