Bug 207268 Add visibility option for plot within axes
For chart with axes, we should make plot within axes invisible. Meantime, other plots, such as axes, legend and title, should be visible. This enhancement doesn't include UI change, and it is required for cross tab integration.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/layout/LayoutPackage.java
* @generated
		 */
		EClass LEGEND = eINSTANCE.getLegend( );
		/**
		 * The meta object literal for the '<em><b>Horizontal Spacing</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute LEGEND__HORIZONTAL_SPACING = eINSTANCE.getLegend_HorizontalSpacing( );
		/**
		 * The meta object literal for the '<em><b>Vertical Spacing</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute LEGEND__VERTICAL_SPACING = eINSTANCE.getLegend_VerticalSpacing( );
		/**
		 * The meta object literal for the '<em><b>Client Area</b></em>' containment reference feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EReference LEGEND__CLIENT_AREA = eINSTANCE.getLegend_ClientArea( );
		/**
		 * The meta object literal for the '<em><b>Text</b></em>' containment reference feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */