# 8.18.3.16 IfcShapeModel

AbRV ⓘ
RV ⓘ

ABSTRACT This definition may not be instantiated

## 8.18.3.16.1 Semantic definition

IfcShapeModel represents the concept of a particular geometric and/or topological representation of a product's shape or a product component's shape within a representation context. This representation context has to be a geometric representation context (with the exception of topology representations without associated geometry). The two subtypes are IfcShapeRepresentation to cover geometric models that represent a shape, and IfcTopologyRepresentation to cover the connectivity of a product or product component. The topology may or may not have geometry associated.

The IfcShapeModel can be a shape representation (geometric and/or topologogical) of a product (via IfcProductDefinitionShape), or a shape representation (geometric and/or topologogical) of a component of a product shape (via IfcShapeAspect).

## 8.18.3.16.5 Formal representation

ENTITY IfcShapeModel
ABSTRACT SUPERTYPE OF (ONEOF
(IfcShapeRepresentation
,IfcTopologyRepresentation))
SUBTYPE OF (IfcRepresentation);
INVERSE
OfShapeAspect : SET [0:1] OF IfcShapeAspect FOR ShapeRepresentations;
WHERE
WR11 : (SIZEOF(SELF\IfcRepresentation.OfProductRepresentation) = 1) XOR
(SIZEOF(SELF\IfcRepresentation.RepresentationMap) = 1) XOR
(SIZEOF(OfShapeAspect) = 1);
END_ENTITY;