IfcConnectedFaceSet

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:

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