220.127.116.11.1 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.
18.104.22.168.2 Entity inheritance
Assignment of a globally unique identifier within the entire software world.
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,
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.
Optional description, provided for exchanging informative comments.
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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).
Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatingElement.
Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatedElement.
22.214.171.124.4 Formal propositions
The instance of the RelatingElement shall not be the same instance as the RelatedElement.
126.96.36.199.5 Concept usage
Ownership, history, and merge state is captured using IfcOwnerHistory.
IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.
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188.8.131.52.6 Formal representation
ENTITY IfcRelConnectsElements SUPERTYPE OF (ONEOF (IfcRelConnectsPathElements ,IfcRelConnectsWithRealizingElements)) SUBTYPE OF (IfcRelConnects); ConnectionGeometry : OPTIONAL IfcConnectionGeometry; RelatingElement : IfcElement; RelatedElement : IfcElement; WHERE NoSelfReference : RelatingElement :<>: RelatedElement; END_ENTITY;