#### IfcTopologicalRepresentationItem

Natural language names

##### Semantic definitions at the entity

Entity definition

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

> NOTE: Corresponding STEP entity: topological_representation_item. Please refer to ISO/IS 10303-42:1994, p.129 for the final definition of the formal standard.

> HISTORY: New entity in IFC Release 1.5

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

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

##### Formal representations

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;

EXPRESS-G diagram

`

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