Pset_MaintenanceTriggerPerformance Properties for performance based maintenance policies IfcElement IfcAsset IfcSystem IfcElement,IfcAsset,IfcSystem TargetPerformance Target capacity or performance of the asset. Units of the performance value are specified through the propertyValue units attribute. PerformanceMaintenanceLevel Performance level at which maintenance takes place ReplacementLevel Performance level at which replacement takes place DisposalLevel Performance level at which disposal takes place