IfcMetricValueSelect

Semantic definitions at the type

Type definition

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.

Select definition

Type	Description
IfcMeasureWithUnit
IfcTable
IfcAppliedValue
IfcValue
IfcReference

Formal representations

XSD Specification

 <xs:group name="IfcMetricValueSelect">

  <xs:choice>

   <xs:element ref="ifc:IfcAppliedValue"/>

   <xs:element ref="ifc:IfcAreaMeasure-wrapper"/>

   <xs:element ref="ifc:IfcBoolean-wrapper"/>

   <xs:element ref="ifc:IfcCompoundPlaneAngleMeasure-wrapper"/>

   <xs:element ref="ifc:IfcCountMeasure-wrapper"/>

   <xs:element ref="ifc:IfcDateTime-wrapper"/>

   <xs:element ref="ifc:IfcDuration-wrapper"/>

   <xs:element ref="ifc:IfcDynamicViscosityMeasure-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:IfcLinearStiffnessMeasure-wrapper"/>

   <xs:element ref="ifc:IfcLogical-wrapper"/>

   <xs:element ref="ifc:IfcMassDensityMeasure-wrapper"/>

   <xs:element ref="ifc:IfcMassMeasure-wrapper"/>

   <xs:element ref="ifc:IfcMassPerLengthMeasure-wrapper"/>

   <xs:element ref="ifc:IfcMeasureWithUnit"/>

   <xs:element ref="ifc:IfcModulusOfElasticityMeasure-wrapper"/>

   <xs:element ref="ifc:IfcMolecularWeightMeasure-wrapper"/>

   <xs:element ref="ifc:IfcMomentOfInertiaMeasure-wrapper"/>

   <xs:element ref="ifc:IfcNonNegativeLengthMeasure-wrapper"/>

   <xs:element ref="ifc:IfcNormalisedRatioMeasure-wrapper"/>

   <xs:element ref="ifc:IfcParameterValue-wrapper"/>

   <xs:element ref="ifc:IfcPlaneAngleMeasure-wrapper"/>

   <xs:element ref="ifc:IfcPositiveInteger-wrapper"/>

   <xs:element ref="ifc:IfcPositiveLengthMeasure-wrapper"/>

   <xs:element ref="ifc:IfcPositiveRatioMeasure-wrapper"/>

   <xs:element ref="ifc:IfcPressureMeasure-wrapper"/>

   <xs:element ref="ifc:IfcRatioMeasure-wrapper"/>

   <xs:element ref="ifc:IfcReal-wrapper"/>

   <xs:element ref="ifc:IfcReference"/>

   <xs:element ref="ifc:IfcRotationalStiffnessMeasure-wrapper"/>

   <xs:element ref="ifc:IfcSectionModulusMeasure-wrapper"/>

   <xs:element ref="ifc:IfcTable"/>

   <xs:element ref="ifc:IfcText-wrapper"/>

   <xs:element ref="ifc:IfcThermalExpansionCoefficientMeasure-wrapper"/>

   <xs:element ref="ifc:IfcTimeMeasure-wrapper"/>

   <xs:element ref="ifc:IfcTimeStamp-wrapper"/>

   <xs:element ref="ifc:IfcVolumeMeasure-wrapper"/>

   <xs:element ref="ifc:IfcWarpingConstantMeasure-wrapper"/>

  </xs:choice>

 </xs:group>

EXPRESS Specification


TYPE IfcMetricValueSelect = SELECT (

 IfcMeasureWithUnit, 
 IfcTable, 
 IfcAppliedValue, 
 IfcValue, 
 IfcReference);
END_TYPE;


 EXPRESS-G diagram

Item	SPF	XML	Change
IFC2x3 to IFC4
IfcMetricValueSelect
IfcAppliedValue			ADDED
IfcValue			ADDED
IfcReference			ADDED
IfcDateTimeSelect	X	X	DELETED
IfcText			DELETED
IfcCostValue			DELETED

	Metric Value Select
	Sélection du type de valeur associé à une métrique