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.
XSD Specification:<xs:group name="IfcSizeSelect">
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