#### IfcConnectedFaceSet

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from 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: Corresponding STEP entity: connected_face_set, the subtype closed_shell is included as IfcClosedShell and the subtype open_shell is included as IfcOpenShell. Please refer to ISO/IS 10303-42:1994, p. 144 for the final definition of the formal standard.

> HISTORY: New class in IFC Release 1.0

Informal proposition:

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

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
1 | CfsFaces | IfcFace | S[1:?] | The set of faces arcwise connected along common edges or vertices. | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
IfcRepresentationItem
IfcTopologicalRepresentationItem
IfcConnectedFaceSet
1 | CfsFaces | IfcFace | S[1:?] | The set of faces arcwise connected along common edges or vertices. | X

##### Formal representations

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;

EXPRESS-G diagram

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