IfcSizeSelect

Natural language names
enSize Select
frSélection de taille
Semantic definitions at the type
Type definition

The IfcSizeSelect provides for the selection between different measure types used for provision of a length measure.

NOTE  global units are defined at the single IfcProject instance, given by UnitsInContext:IfcUnitAssignment, the same units are used for the geometric representation items and for the style definitions.
NOTE  Definition according to ISO/CD 10303-46:1992
The size select is a selection of a specific positive length measure.
NOTE  Type adapted from size_select defined in ISO10303-46.
HISTORY  New select type in IFC2x2.
IFC2x3 CHANGE  The SELECT item IfcMeasureWithUnit has been removed from the IfcSizeSelect, the IfcRatioMeasure and IfcDescriptiveMeasure have been added.
Enumeration definition
ConstantDescription
IfcRatioMeasure
IfcLengthMeasure
IfcDescriptiveMeasure
IfcPositiveLengthMeasure
IfcNormalisedRatioMeasure
IfcPositiveRatioMeasure
Formal representations
XSD Specification
 <xs:group name="IfcSizeSelect">
  <xs:choice>
   <xs:element ref="ifc:IfcDescriptiveMeasure-wrapper"/>
   <xs:element ref="ifc:IfcLengthMeasure-wrapper"/>
   <xs:element ref="ifc:IfcNormalisedRatioMeasure-wrapper"/>
   <xs:element ref="ifc:IfcPositiveLengthMeasure-wrapper"/>
   <xs:element ref="ifc:IfcPositiveRatioMeasure-wrapper"/>
   <xs:element ref="ifc:IfcRatioMeasure-wrapper"/>
  </xs:choice>
 </xs:group>
EXPRESS Specification

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