switch ( eDerivedStructuralFeatureID( eFeature ) )
switch ( featureID )
	public void eUnset( EStructuralFeature eFeature )	{		switch ( eDerivedStructuralFeatureID( eFeature ) )		{			case AttributePackage.SIZE__HEIGHT :				unsetHeight( );				return;			case AttributePackage.SIZE__WIDTH :				unsetWidth( );				return;		}		eDynamicUnset( eFeature );	}