Definition from buildingSMART: The
IfcRelProjectsElement is an objectified relationship
between an element and one projection element that
creates a modifier to the shape of the element. This
relationship implies a Boolean operation of addition for
the geometric bodies of the building element and the
The relationship is defined to be a 1:1 relationship, if a
building element has more than one projection, several
relationship objects have to be used, each pointing to a
different projection element.
HISTORY New entity in
Release IFC2x Edition 2.
Element at which a projection is created by the associated IfcProjectionElement.
Reference to the IfcFeatureElementAddition that defines an addition to the volume of the element, by using a Boolean addition operation. An example is a projection at the associated element.