#### 8.17.3.6 IfcTopologicalRepresentationItem

| Item de représentation topologique
| Topologische Repräsentation - Element

> NOTE Definition according to ISO/CD 10303-42:1992
> The topological representation item is the supertype for all the topological representation items in the geometry resource.

> NOTE Entity adapted from topological_representation_item defined in ISO 10303-42.

> HISTORY New entity in IFC1.5

XSD Specification:

<xs:element name="IfcTopologicalRepresentationItem" type="ifc:IfcTopologicalRepresentationItem" abstract="true" substitutionGroup="ifc:IfcRepresentationItem" nillable="true"/>
<xs:complexType name="IfcTopologicalRepresentationItem" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:IfcRepresentationItem"/>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcTopologicalRepresentationItem

| ABSTRACT SUPERTYPE OF(ONEOF(IfcConnectedFaceSet, IfcFace, IfcFaceBound, IfcLoop))

| SUBTYPE OF (IfcRepresentationItem);

END_ENTITY;

Inheritance Graph:

ENTITY IfcTopologicalRepresentationItem

| ENTITY IfcRepresentationItem

| INVERSE

LayerAssignment | : | SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems;
StyledByItem | : | SET [0:1] OF IfcStyledItem FOR Item;

| ENTITY IfcTopologicalRepresentationItem

END_ENTITY;

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