#### 5.4.3.18 IfcRelConnectsElements

| Connection d'éléments
| Verbindet Elemente - Relation

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.

XSD 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(IfcRelConnectsPathElements)

| SUBTYPE OF (IfcRelConnects);

ConnectionGeometry | : | OPTIONAL IfcConnectionGeometry;
RelatingElement | : | IfcElement;
RelatedElement | : | IfcElement;

| WHERE

NoSelfReference | : | RelatingElement :<>: RelatedElement;

END_ENTITY;

Attribute Definitions:

ConnectionGeometry | : | 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).
RelatingElement | : | Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatingElement.
RelatedElement | : | Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatedElement.

Formal Propositions:

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

Inheritance Graph:

ENTITY IfcRelConnectsElements

| ENTITY IfcRoot

GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | OPTIONAL IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;

| ENTITY IfcRelationship

| ENTITY IfcRelConnects

| ENTITY IfcRelConnectsElements

ConnectionGeometry | : | OPTIONAL IfcConnectionGeometry;
RelatingElement | : | IfcElement;
RelatedElement | : | IfcElement;

END_ENTITY;

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