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Definition from buildingSMART: This objectified relationship (IfcRelAssignsToActor) handles the assignment of objects (subtypes of IfcObject) to an actor (subtypes of IfcActor).

The IfcRelAssignsToActor objectified relationship defines a relationship between an IfcActor and one or many objects. An particular role of the actor played in that relationship can be associated. If specified, it takes priority over the role that may be directly assigned to the person or organization.

Example: An occupant (as an actor) may rent (as a special association type) a flat (as a collection of spaces or a zone). This would be an application of this generic relationship.

Reference to the objects (or single object) on which the actor acts upon in a certain role (if given) is specified in the inherited RelatedObjects attribute.

HISTORY New Entity in IFC Release 2.0. Has been renamed from IfcRelActsUpon in IFC Release 2x.

EXPRESS specification:

ENTITY IfcRelAssignsToActor
SUBTYPE OF ( IfcRelAssigns);
RelatingActor  :  IfcActor;
ActingRole  :  OPTIONAL IfcActorRole;
WR1  :  SIZEOF(QUERY(Temp <* SELF\IfcRelAssigns.RelatedObjects | RelatingActor :=: Temp)) = 0;

Attribute definitions:

RelatingActor  :  Reference to the information about the actor. It comprises the information about the person or organization and its addresses.
ActingRole  :  Role of the actor played within the context of the assignment to the object(s).

Formal Propositions:

WR1  :  The instance to with the relation points shall not be contained in the List of RelatedObjects.

Inheritance graph

ENTITY IfcRelAssignsToActor;
GlobalId  :  IfcGloballyUniqueId;
OwnerHistory  :  IfcOwnerHistory;
Name  :  OPTIONAL IfcLabel;
Description  :  OPTIONAL IfcText;
ENTITY IfcRelationship;
ENTITY IfcRelAssigns;
RelatedObjects  :  SET [1:?] OF IfcObjectDefinition;
RelatedObjectsType  :  OPTIONAL IfcObjectTypeEnum;
ENTITY IfcRelAssignsToActor;
RelatingActor  :  IfcActor;
ActingRole  :  OPTIONAL IfcActorRole;