#### 8.12.2.1 IfcLayeredItem

The IfcLayeredItem is the collection of all those items, that are assigned to a single layer. These items are representation items or complete representations (IfcRepresentationItem, IfcRepresentation). If an IfcRepresentation is referenced, all IfcRepresentationItem within its set of Items are assigned to the same layer.

> NOTE Definition according to ISO 10303-46:
> The layered things type selects those things, which can be grouped in layers.

> NOTE Corresponding ISO 10303 name: layered_item. It was called layered_things in the ISO/CD version and had been renamed to layered_item in the ISO/IS final version. Please refer to ISO/IS 10303-46:1994, p. 13 for the final definition of the formal standard.

> HISTORY New type in IFC2x2.

XSD Specification:

<xs:group name="IfcLayeredItem">
<xs:choice>
<xs:element ref="ifc:IfcRepresentation"/>
<xs:element ref="ifc:IfcRepresentationItem"/>
</xs:choice>
</xs:group>

EXPRESS Specification:

TYPE IfcLayeredItem = SELECT (
| IfcRepresentationItem, IfcRepresentation);
END_TYPE;

Link to this page