#### 8.4.2.1 IfcClassificationReferenceSelect

The IfcClassificationReferenceSelect enables selection of whether a classification reference is a subset of another classification reference or is a top level entry of a classification source.

> HISTORY New Select Type in IFC2x

XSD Specification:

<xs:group name="IfcClassificationReferenceSelect">
<xs:choice>
<xs:element ref="ifc:IfcClassification"/>
<xs:element ref="ifc:IfcClassificationReference"/>
</xs:choice>
</xs:group>

EXPRESS Specification:

TYPE IfcClassificationReferenceSelect = SELECT (
| IfcClassificationReference, IfcClassification);
END_TYPE;

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