switch ( eDerivedStructuralFeatureID( eFeature ) )
switch ( featureID )
	public boolean eIsSet( EStructuralFeature eFeature )	{		switch ( eDerivedStructuralFeatureID( eFeature ) )		{			case DataPackage.DATE_TIME_DATA_ELEMENT__VALUE :				return isSetValue( );		}		return eDynamicIsSet( eFeature );	}