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
* <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute LEGEND__SHOW_PERCENT = eINSTANCE.getLegend_ShowPercent( );
		/**
		 * The meta object literal for the '<em><b>Show Total</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute LEGEND__SHOW_TOTAL = eINSTANCE.getLegend_ShowTotal( );
		/**
		 * The meta object literal for the '<em><b>Wrapping Size</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute LEGEND__WRAPPING_SIZE = eINSTANCE.getLegend_WrappingSize( );
		/**
		 * The meta object literal for the '{@link org.eclipse.birt.chart.model.layout.impl.PlotImpl <em>Plot</em>}' class.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @see org.eclipse.birt.chart.model.layout.impl.PlotImpl
		 * @see org.eclipse.birt.chart.model.layout.impl.LayoutPackageImpl#getPlot()
		 * @generated
		 */
		EClass PLOT = eINSTANCE.getPlot( );
		/**
		 * The meta object literal for the '<em><b>Horizontal Spacing</b></em>' attribute feature.
		 * <!-- begin-user-doc -->