#### IfcRepresentationItem

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from ISO/CD 10303-43:1992: A representation item is an element of product data that participates in one or more representations or contributes to the definition of another representation item. A representation item contributes to the definition of another representation item when it is referenced by that representation item.

Definition from IAI The IfcRepresentationItem is used within (and only within - directly or indirectly through other IfcRepresentationItem's or IfcShapeAspect's) an IfcRepresentation to represent an IfcProductRepresentation. Most commonly these IfcRepresentationItem's are geometric or topological representation items, that can (but not need to) have presentation style infomation assigned.

> NOTE Corresponding STEP entity: representation_item. Please refer to ISO/IS 10303-43:1994, for the final definition of the formal standard. The following changes have been made: The attribute 'name' and the WR1 have not been incorporated.

> HISTORY New entity in IFC Release 2x.
> IFC2x Edition 3 CHANGE The inverse attributes StyledByItem and LayerAssignments have been added. Upward compatibility for file based exchange is guaranteed.

Attribute definitions

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

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

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

##### Formal representations

XSD Specification
`<xs:element name="IfcRepresentationItem" type="ifc:IfcRepresentationItem" abstract="true" substitutionGroup="ifc:Entity" nillable="true"/>
<xs:complexType name="IfcRepresentationItem" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:Entity"/>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcRepresentationItem
ABSTRACT SUPERTYPE OF(ONEOF(IfcGeometricRepresentationItem, IfcMappedItem, IfcTopologicalRepresentationItem));
INVERSE
END_ENTITY;

EXPRESS-G diagram

`

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