#### IfcValue

Natural language names

##### Semantic definitions at the type

Type definition

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/CD 10303-41.
- IfcDerivedMeasureValue A select type for derived measure types.

> HISTORY New type in IFC Release 2x.

Enumeration definition

Constant | Description
--- | ---
IfcMeasureValue |
IfcSimpleValue |
IfcDerivedMeasureValue |

##### Formal representations

XSD Specification
`<xs:group name="IfcValue">
<xs:choice>
<xs:element ref="ifc:IfcBoolean-wrapper"/>
<xs:element ref="ifc:IfcCountMeasure-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:IfcParameterValue-wrapper"/>
<xs:element ref="ifc:IfcPlaneAngleMeasure-wrapper"/>
<xs:element ref="ifc:IfcPositiveLengthMeasure-wrapper"/>
<xs:element ref="ifc:IfcPositivePlaneAngleMeasure-wrapper"/>
<xs:element ref="ifc:IfcPositiveRatioMeasure-wrapper"/>
<xs:element ref="ifc:IfcRatioMeasure-wrapper"/>
<xs:element ref="ifc:IfcReal-wrapper"/>
<xs:element ref="ifc:IfcText-wrapper"/>
<xs:element ref="ifc:IfcTimeStamp-wrapper"/>
</xs:choice>
</xs:group>
`
EXPRESS Specification
`TYPE IfcValue = SELECT (
IfcMeasureValue,
IfcSimpleValue);
END_TYPE;

EXPRESS-G diagram

`

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