#### 8.8.2.2 IfcLayerSetDirectionEnum

IfcLayerSetDirectionEnum provides identification of the axis of element geometry, denoting the layer set thickness direction, or direction of layer offsets.

Enumerated Item Definitions:

- AXIS1: Usually x-axis.
- AXIS2: Usually y-axis.
- AXIS3: Usually z-axis.

> HISTORY New Type in IFC2x.

XSD Specification:

<xs:simpleType name="IfcLayerSetDirectionEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="axis1"/>
<xs:enumeration value="axis2"/>
<xs:enumeration value="axis3"/>
</xs:restriction>
</xs:simpleType>

EXPRESS Specification:

TYPE IfcLayerSetDirectionEnum = ENUMERATION OF (
| AXIS1, AXIS2, AXIS3);
END_TYPE;

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