code: @Override
  	public EClass getIfcPerformanceHistory() {
  		if (ifcPerformanceHistoryEClass == null) {
  			ifcPerformanceHistoryEClass = (EClass) EPackage.Registry.INSTANCE.getEPackage(Ifc4Package.eNS_URI)
  					.getEClassifiers().get(409);
  		}
  		return ifcPerformanceHistoryEClass;
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated