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