IFC (IFC4X3_ADD2) under development IfcRelConnectsElements Semantic 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.

  • 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. Entity inheritance Attributes

# Attribute Type Description
IfcRoot (4)
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,

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.

Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes
IfcRelConnectsElements (3)
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.

Table Formal propositions

Name Description

The instance of the RelatingElement shall not be the same instance as the RelatedElement.

RelatingElement :<>: RelatedElement
Table Concept usage

Concept Usage Description
IfcRoot (2)
Revision Control General

Ownership, history, and merge state is captured using IfcOwnerHistory.

Software Identity General

IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.

Click to show 2 hidden inherited concepts Click to hide 2 inherited concepts
Table Examples Formal representation

ENTITY IfcRelConnectsElements
 SUBTYPE OF (IfcRelConnects);
	ConnectionGeometry : OPTIONAL IfcConnectionGeometry;
	RelatingElement : IfcElement;
	RelatedElement : IfcElement;
	NoSelfReference : RelatingElement :<>: RelatedElement;
END_ENTITY; References

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  • where rule, NoSelfReference
  • where rule, WR31