code: public EEnum getIfcWindowPanelOperationEnum() {
  		if (ifcWindowPanelOperationEnumEEnum == null) {
  			ifcWindowPanelOperationEnumEEnum = (EEnum) EPackage.Registry.INSTANCE.getEPackage(Ifc2x3tc1Package.eNS_URI)
  					.getEClassifiers().get(929);
  		}
  		return ifcWindowPanelOperationEnumEEnum;
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated