Natural language names
Gruppe verbundender Flächen
Connected Face Set
Ensemble de faces connectées
Semantic definitions at the entity
Entity definition

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.
Attribute definitions
#AttributeTypeCardinalityDescription G
1CfsFacesIfcFaceS[1:?] The set of faces arcwise connected along common edges or vertices.X
Inherited definitions from supertypes
Entity inheritance IfcClosedShell IfcOpenShell IfcTopologicalRepresentationItem IfcRepresentationItem
Attribute inheritance
S[0:1]Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.
IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added.
IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
S[0:1]Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.
IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
1CfsFacesIfcFaceS[1:?] The set of faces arcwise connected along common edges or vertices.X
Formal representations
XML Specification
 <xs:element name="IfcConnectedFaceSet" type="ifc:IfcConnectedFaceSet" substitutionGroup="ifc:IfcTopologicalRepresentationItem" nillable="true"/>
 <xs:complexType name="IfcConnectedFaceSet">
   <xs:extension base="ifc:IfcTopologicalRepresentationItem">
     <xs:element name="CfsFaces">
        <xs:element ref="ifc:IfcFace" maxOccurs="unbounded"/>
       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcFace"/>
       <xs:attribute ref="ifc:cType" fixed="set"/>
       <xs:attribute ref="ifc:arraySize" use="optional"/>
EXPRESS Specification
ENTITY IfcConnectedFaceSet
 SUPERTYPE OF(ONEOF(IfcClosedShell, IfcOpenShell))
 SUBTYPE OF (IfcTopologicalRepresentationItem);
  CfsFaces : SET [1:?] OF IfcFace;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcFaceBasedSurfaceModel

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