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Definition from buildingSMART: This objectified relationship (IfcRelDefinesByProperties) defines the relationships between property set definitions and objects. Properties are aggregated in property sets, property sets can be grouped to define an object type.

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 IFC Release 2.0. Has been renamed from IfcRelAssignsProperties in IFC Release 2x.

EXPRESS specification:

ENTITY IfcRelDefinesByProperties
SUPERTYPE OF (IfcRelOverridesProperties)
SUBTYPE OF ( IfcRelDefines);
RelatingPropertyDefinition  :  IfcPropertySetDefinition;

Attribute definitions:

RelatingPropertyDefinition  :  Reference to the property set definition for that object or set of objects.

Inheritance graph

ENTITY IfcRelDefinesByProperties;
GlobalId  :  IfcGloballyUniqueId;
OwnerHistory  :  IfcOwnerHistory;
Name  :  OPTIONAL IfcLabel;
Description  :  OPTIONAL IfcText;
ENTITY IfcRelationship;
ENTITY IfcRelDefines;
RelatedObjects  :  SET [1:?] OF IfcObject;
ENTITY IfcRelDefinesByProperties;
RelatingPropertyDefinition  :  IfcPropertySetDefinition;