#### 5.4.2.4 IfcSpaceBoundarySelect

The IfcSpaceBoundarySelect selects either an internal space for internal or external space boundaries, or an external spatial element for external space boundaries at the outer envelop of the building.

> HISTORY New select type in IFC4.

SELECT

- IfcSpace,
- IfcExternalSpatialElement

XSD Specification:

<xs:group name="IfcSpaceBoundarySelect">
<xs:choice>
<xs:element ref="ifc:IfcSpace"/>
</xs:choice>
</xs:group>

EXPRESS Specification:

TYPE IfcSpaceBoundarySelect = SELECT (
| IfcSpace);
END_TYPE;

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