#### IfcShapeModel

Natural language names

##### Semantic definitions at the entity

Entity definition

The 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 the geometric models (or sets) that represent a shape, and IfcTopologyRepresentation to cover the conectivity 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).

> HISTORY New entity in Release IFC 2x Edition 3.

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---

Formal Propositions

Rule | Description
--- | ---
WR11 | The IfcShapeModel shall be used by an IfcProductRepresentation, by an IfcRepresentationMap or by an IfcShapeAspect.

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
IfcRepresentation
1 | ContextOfItems | IfcRepresentationContext | [1:1] | Definition of the representation context for which the different subtypes of representation are valid. | X
2 | RepresentationIdentifier | IfcLabel | [0:1] | The optional identifier of the representation as used within a project. | X
3 | RepresentationType | IfcLabel | [0:1] | The description of the type of a representation context. The representation type defines the type of geometry or topology used for representing the product representation. More information is given at the subtypes IfcShapeRepresentation and IfcTopologyRepresentation. The supported values for context type are to be specified by implementers agreements. | X
4 | Items | IfcRepresentationItem | S[1:?] | Set of geometric representation items that are defined for this representation. | X
| RepresentationMap | IfcRepresentationMap @MappedRepresentation | S[0:1] | Use of the representation within an IfcRepresentationMap. If used, this IfcRepresentation may be assigned to many representations as one of its Items using an IfcMappedItem. Using IfcRepresentationMap is the way to share one representation (often of type IfcShapeRepresentation) by many products. |
| OfProductRepresentation | IfcProductRepresentation @Representations | S[0:1] | Reference to the product shape, for which it is the shape representation. |
IfcShapeModel

##### Formal representations

XSD Specification
`<xs:element name="IfcShapeModel" type="ifc:IfcShapeModel" abstract="true" substitutionGroup="ifc:IfcRepresentation" nillable="true"/>
<xs:complexType name="IfcShapeModel" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:IfcRepresentation"/>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcShapeModel
ABSTRACT SUPERTYPE OF(IfcShapeRepresentation)
SUBTYPE OF (IfcRepresentation);
INVERSE
WHERE
WR11 : (SIZEOF(SELF\IfcRepresentation.OfProductRepresentation) = 1) XOR (SIZEOF(SELF\IfcRepresentation.RepresentationMap) = 1) XOR (SIZEOF(OfShapeAspect) = 1);
END_ENTITY;

EXPRESS-G diagram

`

Link to this page