IFC 4.3.x development

5.4.3.38 IfcRelConnectsElements

Change log

5.4.3.38.1 Semantic definitions at the entity

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.

• In this case the geometrical constraints of the connection are provided by the optional relationship to the IfcConnectionGeometry. The connection geometry is provided as a point, curve or surface within the local placement coordinate systems of the connecting elements.
• If the connection geometry is omitted then the connection is provided as a logical connection. Under this circumstance, the connection point, curve or surface has to be recalculated by the receiving application.

HISTORY  New entity in IFC1.0.

5.4.3.38.1 Attributes

#	Attribute	Type	Description
IfcRoot
1	GlobalId	IfcGloballyUniqueId	Assignment of a globally unique identifier within the entire software world.
2	OwnerHistory	OPTIONAL IfcOwnerHistory	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.
3	Name	OPTIONAL IfcLabel	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.
4	Description	OPTIONAL IfcText	Optional description, provided for exchanging informative comments.
IfcRelationship
IfcRelConnects
IfcRelConnectsElements
5	ConnectionGeometry	OPTIONAL IfcConnectionGeometry	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).
6	RelatingElement	IfcElement	Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatingElement.
7	RelatedElement	IfcElement	Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatedElement.

5.4.3.38.2 Entity inheritance

5.4.3.38.3 Definitions applying to General Usage

5.4.3.38.3.1 Identity

5.4.3.38.3.2 Revision Control

5.4.3.38.4 Formal representations

ENTITY IfcRelConnectsElements
 SUPERTYPE OF (ONEOF
	(IfcRelConnectsPathElements
	,IfcRelConnectsWithRealizingElements))
 SUBTYPE OF (IfcRelConnects);
	ConnectionGeometry : OPTIONAL IfcConnectionGeometry;
	RelatingElement : IfcElement;
	RelatedElement : IfcElement;
 WHERE
	NoSelfReference : RelatingElement :<>: RelatedElement;
END_ENTITY;