#### 8.17.3.4 IfcFaceBound

| Contour de face
| Flächenbegrenzung - Topologie

> NOTE Definition according to ISO/CD 10303-42:1992
> A face bound is a loop which is intended to be used for bounding a face.

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

> HISTORY New entity in IFC1.0

XSD Specification:

<xs:element name="IfcFaceBound" type="ifc:IfcFaceBound" substitutionGroup="ifc:IfcTopologicalRepresentationItem" nillable="true"/>
<xs:complexType name="IfcFaceBound">
<xs:complexContent>
<xs:extension base="ifc:IfcTopologicalRepresentationItem">
<xs:sequence>
<xs:element name="Bound" type="ifc:IfcLoop" nillable="true"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcFaceBound

| SUBTYPE OF (IfcTopologicalRepresentationItem);

Bound | : | IfcLoop;
Orientation | : | IfcStrippedOptional;

END_ENTITY;

Attribute Definitions:

Bound | : | The loop which will be used as a face boundary.
Orientation | : | 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.

Inheritance Graph:

ENTITY IfcFaceBound

| ENTITY IfcRepresentationItem

| INVERSE

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

| ENTITY IfcTopologicalRepresentationItem

| ENTITY IfcFaceBound

Bound | : | IfcLoop;
Orientation | : | IfcStrippedOptional;

END_ENTITY;

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