#### 5.1.3.31 IfcRelDefinesByProperties

| Définition par propriétés
| Definiert durch Merkmale - Relation: Relation zwischen einem Objekt und dessen beschreibenden Merkmalen

The objectified relationship IfcRelDefinesByProperties defines the relationships between property set definitions and objects. Properties are aggregated in property sets. Property sets can be either directly assigned to occurrence objects using this relationship, or assigned to an object type and assigned via that type to occurrence objects.

The IfcRelDefinesByProperties is a 1-to-N relationship, as it allows for the assignment of one property set to a single or to many objects. Those objects then share the same property definition.

> HISTORY New entity in IFC2.0. Has been renamed from IfcRelAssignsProperties in IFC2x.

> IFC4 CHANGE The attribute RelatedObjects had been demoted from the supertype IfcRelDefines to IfcRelDefinesByProperties.

XSD Specification:

<xs:element name="IfcRelDefinesByProperties" type="ifc:IfcRelDefinesByProperties" substitutionGroup="ifc:IfcRelDefines" nillable="true"/>
<xs:complexType name="IfcRelDefinesByProperties">
<xs:complexContent>
<xs:extension base="ifc:IfcRelDefines">
<xs:sequence>
<xs:element name="RelatedObjects" type="ifc:IfcObjectDefinition" nillable="true" maxOccurs="1"/>
<xs:element name="RelatingPropertyDefinition">
<xs:complexType>
<xs:group ref="ifc:IfcPropertySetDefinitionSelect"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcRelDefinesByProperties

| SUBTYPE OF IfcRelDefines;

RelatedObjects | : | SET [1:1] OF IfcObjectDefinition;
RelatingPropertyDefinition | : | IfcPropertySetDefinitionSelect;

END_ENTITY;

EXPRESS-G diagram

Attribute Definitions:

RelatedObjects | : | Reference to the objects (or single object) to which the property definition applies. IFC4 CHANGE Data type promoted from subtype IfcObject.
RelatingPropertyDefinition | : | Reference to the property set definition for that object or set of objects.

Inheritance Graph:

ENTITY IfcRelDefinesByProperties

| ENTITY IfcRoot

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

| ENTITY IfcRelationship

| ENTITY IfcRelDefines

| ENTITY IfcRelDefinesByProperties

RelatedObjects | : | SET [1:1] OF IfcObjectDefinition;
RelatingPropertyDefinition | : | IfcPropertySetDefinitionSelect;

END_ENTITY;

Examples:

- Air terminal element

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