#### 8.5.2.4 IfcLibrarySelect

The IfcLibrarySelect enables selection of whether library information is to be contained within an IFC model or is to be referenced from an external source.

> It is expected that selection will be IfcLibraryReference and only rarely IfcLibraryInformation. IfcLibraryInformation should only be selected in circumstances where there could be a need to indicate the libraries that will be used without making individual references. This may occur for higher level objects such as a IfcProject or IfcBuilding.

> HISTORY New select type in IFC2x

XSD Specification:

<xs:group name="IfcLibrarySelect">
<xs:choice>
<xs:element ref="ifc:IfcLibraryInformation"/>
</xs:choice>
</xs:group>

EXPRESS Specification:

TYPE IfcLibrarySelect = SELECT (
| IfcLibraryInformation);
END_TYPE;

EXPRESS-G diagram

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