# 8.7.3.13 IfcLinearPlacement

## 8.7.3.13.1 Semantic definition

IfcLinearPlacement provides a specialization of IfcObjectPlacement in which the placement and axis direction of the object coordinate system is defined by a reference to a curve. RelativePlacement is therefore restricted to IfcAxis2PlacementLinear.

## 8.7.3.13.5 Formal representation

ENTITY IfcLinearPlacement
SUBTYPE OF (IfcObjectPlacement);
RelativePlacement : IfcAxis2PlacementLinear;
CartesianPosition : OPTIONAL IfcAxis2Placement3D;
END_ENTITY;