Pset_ConstructionOccurence Property set for construction occurrence. IfcElement IfcElement InstallationDate Date on which the element is installed. ModelNumber The model number and/or unit designator assigned by the manufacturer of the manufactured item. TagNumber Tag number. AssetIdentifier A unique identification assigned to an asset that enables its differentiation from other assets. > NOTE  The asset identifier is unique within the asset register. It differs from the globally unique id assigned to the instance of an entity populating a database.