#### 5.1.3.21 IfcRelationship

| Relation
| Objektifizierte Relation (allgemein)

IfcRelationship is the abstract generalization of all objectified relationships in IFC. Objectified relationships are the preferred way to handle relationships among objects. This allows to keep relationship specific properties directly at the relationship and opens the possibility to later handle relationship specific behavior.

There are two different types of relationships, 1-to-1 relationships and 1-to-many relationship. used within the subtypes of IfcRelationship. The following convention applies to all subtypes:

- The two sides of the objectified relationship are named
  - Relating+<name of relating object> and
  - Related+<name of related object>
- In case of the 1-to-many relationship, the related side of the relationship shall be an aggregate SET 1:N

> HISTORY New entity in IFC1.0.

XSD Specification:

<xs:element name="IfcRelationship" type="ifc:IfcRelationship" abstract="true" substitutionGroup="ifc:IfcRoot" nillable="true"/>
<xs:complexType name="IfcRelationship" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:IfcRoot"/>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcRelationship

| ABSTRACT SUPERTYPE OF(ONEOF(IfcRelAssigns, IfcRelAssociates, IfcRelConnects, IfcRelDeclares, IfcRelDecomposes, IfcRelDefines))

| SUBTYPE OF (IfcRoot);

END_ENTITY;

Inheritance Graph:

ENTITY IfcRelationship

| ENTITY IfcRoot

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

| ENTITY IfcRelationship

END_ENTITY;

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