# 5.4.3.56 IfcRelProjectsElement

## 5.4.3.56.1 Semantic definition

The IfcRelProjectsElement is an objectified relationship between an element and one projection element that creates a modifier to the shape of the element. The relationship is defined to be a 1:1 relationship, if an element has more than one projection, several relationship objects have to be used, each pointing to a different projection element. The IfcRelProjectsElement establishes an aggregation relationship between the main element and a sub ordinary addition feature.

The IfcRelProjectsElement implies a Boolean operation of addition for the geometric bodies of the element and the feature element. As with all decomposition relationships it determines:

## 5.4.3.56.5 Formal representation

ENTITY IfcRelProjectsElement
SUBTYPE OF (IfcRelDecomposes);
RelatingElement : IfcElement;
END_ENTITY;