#### 8.2.2.4 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:IfcDate-wrapper"/>
<xs:element ref="ifc:IfcDateTime-wrapper"/>
<xs:element ref="ifc:IfcDuration-wrapper"/>
<xs:element ref="ifc:IfcIdentifier-wrapper"/>
<xs:element ref="ifc:IfcInteger-wrapper"/>
<xs:element ref="ifc:IfcLabel-wrapper"/>
<xs:element ref="ifc:IfcLengthMeasure-wrapper"/>
<xs:element ref="ifc:IfcMeasureWithUnit"/>
<xs:element ref="ifc:IfcMonetaryMeasure-wrapper"/>
<xs:element ref="ifc:IfcPositiveLengthMeasure-wrapper"/>
<xs:element ref="ifc:IfcReal-wrapper"/>
<xs:element ref="ifc:IfcReference"/>
<xs:element ref="ifc:IfcTable"/>
<xs:element ref="ifc:IfcText-wrapper"/>
<xs:element ref="ifc:IfcTime-wrapper"/>
<xs:element ref="ifc:IfcTimeStamp-wrapper"/>
</xs:choice>
</xs:group>

EXPRESS Specification:

TYPE IfcMetricValueSelect = SELECT (
| IfcMeasureWithUnit, IfcTable, IfcValue, IfcReference);
END_TYPE;

Link to this page