#### 5.1.2.4 IfcPropertySetDefinitionSelect

The purpose of this select type is enabling th assignment of a set of IfcPropertySet's using the relationship IfcRelDefinesByProperties relationship in addition to a single IfcPropertySet.

> NOTE The sole purpose of this select type is to enable an upward compatible enhancement of the objectified relationship IfcRelDefinesByProperties in order to assign multiple IfcPropertySet's, IfcElementQuantity's or other subtypes of IfcPropertySetDefinition to objects using a single instance of IfcRelDefinesByProperties.

> HISTORY New select type in IFC4.

XSD Specification:

<xs:group name="IfcPropertySetDefinitionSelect">
<xs:choice>
<xs:element ref="ifc:IfcPropertySetDefinition"/>
</xs:choice>
</xs:group>

EXPRESS Specification:

TYPE IfcPropertySetDefinitionSelect = SELECT (
| IfcPropertySetDefinition);
END_TYPE;

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