#### 8.6.2.3 IfcCsgSelect

Select type enabling the choice between IfcBooleanResult and subtypes of IfcCsgPrimitive3D as potential root tree expression at IfcCsgSolid.

> NOTE Definition from ISO 10303-42:
> This type identifies the types of entity which may be selected as the root of a CSG tree including a single CSG primitive as a special case.

> NOTE Corresponding STEP type csg_select defined in ISO 10303-42.

> HISTORY New type in IFC1.5.1.

XSD Specification:

<xs:group name="IfcCsgSelect">
<xs:choice>
<xs:element ref="ifc:IfcBooleanResult"/>
</xs:choice>
</xs:group>

EXPRESS Specification:

TYPE IfcCsgSelect = SELECT (
| IfcBooleanResult);
END_TYPE;

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