188.8.131.52.1 Semantic definition
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.
184.108.40.206.2 Type values
220.127.116.11.3 Formal representation
TYPE IfcLayeredItem = SELECT (IfcRepresentation ,IfcRepresentationItem); END_TYPE;