IfcRelConnectsElements

Natural language names
Verbindet Elemente - Relation
Rel Connects Elements
Connection d'éléments
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4 4.0.0.0
    IfcRelConnectsElements
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
Semantic definitions at the entity
Entity definition

The IfcRelConnectsElements objectified relationship provides the generalization of the connectivity between elements. It is a 1 to 1 relationship. The concept of two elements being physically or logically connected is described independently from the connecting elements. The connectivity may be related to the shape representation of the connected entities by providing a connection geometry.

HISTORY  New entity in IFC1.0.

Attribute definitions
#AttributeTypeCardinalityDescription G
5ConnectionGeometryIfcConnectionGeometry? The geometric shape representation of the connection geometry that is provided in the object coordinate system of the RelatingElement (mandatory) and in the object coordinate system of the RelatedElement (optionally). X
6RelatingElementIfcElement Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatingElement. X
7RelatedElementIfcElement Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatedElement. X
Formal Propositions
RuleDescription
NoSelfReferenceThe instance of the RelatingElement shall not be the same instance as the RelatedElement.
Inherited definitions from supertypes
Entity inheritance IfcRelConnectsPathElements IfcRelConnectsWithRealizingElements IfcRelConnects IfcRelationship IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,
NOTE  only the last modification in stored - either as addition, deletion or modification.
IFC4 CHANGE  The attribute has been changed to be OPTIONAL.
X
3NameIfcLabel? Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule. X
4DescriptionIfcText? Optional description, provided for exchanging informative comments. X
IfcRelationship
IfcRelConnects
IfcRelConnectsElements
5ConnectionGeometryIfcConnectionGeometry? The geometric shape representation of the connection geometry that is provided in the object coordinate system of the RelatingElement (mandatory) and in the object coordinate system of the RelatedElement (optionally). X
6RelatingElementIfcElement Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatingElement. X
7RelatedElementIfcElement Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatedElement. X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcRelConnectsElements" type="ifc:IfcRelConnectsElements" substitutionGroup="ifc:IfcRelConnects" nillable="true"/>
 <xs:complexType name="IfcRelConnectsElements">
  <xs:complexContent>
   <xs:extension base="ifc:IfcRelConnects">
    <xs:sequence>
     <xs:element name="ConnectionGeometry" type="ifc:IfcConnectionGeometry" nillable="true" minOccurs="0"/>
     <xs:element name="RelatingElement" type="ifc:IfcElement" nillable="true"/>
     <xs:element name="RelatedElement" type="ifc:IfcElement" nillable="true"/>
    </xs:sequence>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcRelConnectsElements
 SUPERTYPE OF(ONEOF(IfcRelConnectsPathElements, IfcRelConnectsWithRealizingElements))
 SUBTYPE OF (IfcRelConnects);
  ConnectionGeometry : OPTIONAL IfcConnectionGeometry;
  RelatingElement : IfcElement;
  RelatedElement : IfcElement;
 WHERE
  NoSelfReference : RelatingElement :<>: RelatedElement;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcElement

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