setGroupType(GROUP_TYPE_EDEFAULT);
unsetGroupType();
    public void eUnset(EStructuralFeature eFeature)    {        switch (eDerivedStructuralFeatureID(eFeature))        {            case DataPackage.SERIES_GROUPING__ENABLED:                unsetEnabled();                return;            case DataPackage.SERIES_GROUPING__GROUPING_UNIT:                setGroupingUnit(GROUPING_UNIT_EDEFAULT);                return;            case DataPackage.SERIES_GROUPING__GROUPING_INTERVAL:                unsetGroupingInterval();                return;            case DataPackage.SERIES_GROUPING__GROUP_TYPE:                setGroupType(GROUP_TYPE_EDEFAULT);                return;            case DataPackage.SERIES_GROUPING__AGGREGATE_EXPRESSION:                setAggregateExpression(AGGREGATE_EXPRESSION_EDEFAULT);                return;        }        eDynamicUnset(eFeature);    }