#### IfcFaceOuterBound

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from ISO/CD 10303-42:1992: A face outer bound is a special subtype of face bound which carries the additional semantics of defining an outer boundary on the face. No more than one boundary of a face shall be of this type.

> NOTE Corresponding STEP entity: face_outer_bound. Please refer to ISO/IS 10303-42:1994, p. 139 for the final definition of the formal standard.

> HISTORY New class in IFC Release 1.0

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
IfcRepresentationItem
IfcTopologicalRepresentationItem
IfcFaceBound
1 | Bound | IfcLoop | [1:1] | The loop which will be used as a face boundary. | X
2 | Orientation | BOOLEAN | [1:1] | This indicated whether (TRUE) or not (FALSE) the loop has the same sense when used to bound the face as when first defined. If sense is FALSE the senses of all its component oriented edges are implicitly reversed when used in the face. | X
IfcFaceOuterBound

##### Formal representations

XSD Specification
`<xs:element name="IfcFaceOuterBound" type="ifc:IfcFaceOuterBound" substitutionGroup="ifc:IfcFaceBound" nillable="true"/>
<xs:complexType name="IfcFaceOuterBound">
<xs:complexContent>
<xs:extension base="ifc:IfcFaceBound"/>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcFaceOuterBound
SUBTYPE OF (IfcFaceBound);
END_ENTITY;

EXPRESS-G diagram

`

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