Definition from IAI: Objectified Relationship between an building
element and one opening element that creates a void in the element. This
relationship implies a Boolean Operation of subtraction for the geometric
bodies of Element and Opening Element.
HISTORY New entity in IFC Release
|building element in which a void is created by associated opening feature subtraction element.
IFC2x PLATFORM CHANGE: The data type has been changed from IfcBuildingElement to IfcElement with upward compatibility for file based exchange.
Reference to the
|opening feature subtraction element which defines a void in the associated opening element.
IFC2x PLATFORM CHANGE The data type has been changed from IfcOpeningElement to IfcFeatureElementSubtraction with upward compatibility for file based exchange.