#### 8.17.3.2 IfcConnectedFaceSet

| Ensemble de faces connectées
| Gruppe verbundender Flächen

> NOTE Definition according to ISO/CD 10303-42:1992
> A connected_face_set is a set of faces such that the domain of faces together with their bounding edges and vertices is connected.

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

> HISTORY New entity in IFC1.0

Informal Propositions:

1. The union of the domains of the faces and their bounding loops shall be arcwise connected.

XSD Specification:

<xs:element name="IfcConnectedFaceSet" type="ifc:IfcConnectedFaceSet" substitutionGroup="ifc:IfcTopologicalRepresentationItem" nillable="true"/>
<xs:complexType name="IfcConnectedFaceSet">
<xs:complexContent>
<xs:extension base="ifc:IfcTopologicalRepresentationItem">
<xs:sequence>
<xs:element name="CfsFaces">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcFace" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcFace"/>
<xs:attribute ref="ifc:cType" fixed="set"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcConnectedFaceSet

| SUPERTYPE OF(IfcClosedShell)

| SUBTYPE OF (IfcTopologicalRepresentationItem);

CfsFaces | : | SET [1:?] OF IfcFace;

END_ENTITY;

Attribute Definitions:

CfsFaces | : | The set of faces arcwise connected along common edges or vertices.

Inheritance Graph:

ENTITY IfcConnectedFaceSet

| ENTITY IfcRepresentationItem

| INVERSE

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

| ENTITY IfcTopologicalRepresentationItem

| ENTITY IfcConnectedFaceSet

CfsFaces | : | SET [1:?] OF IfcFace;

END_ENTITY;

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