IfcLayeredItem

Definition from ISO/CD 10303-46:1992: The layered things type selects those things, which can be grouped in layers.

Definition from IAI: It 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: Corresponding STEP 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 Release IFC2x 2nd Edition.

EXPRESS specification:

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