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
* <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute BLOCK__ROWSPAN = eINSTANCE.getBlock_Rowspan( );
		/**
		 * The meta object literal for the '<em><b>Columnspan</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute BLOCK__COLUMNSPAN = eINSTANCE.getBlock_Columnspan( );
		/**
		 * The meta object literal for the '<em><b>Min Size</b></em>' containment reference feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EReference BLOCK__MIN_SIZE = eINSTANCE.getBlock_MinSize( );
		/**
		 * The meta object literal for the '<em><b>Outline</b></em>' containment reference feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EReference BLOCK__OUTLINE = eINSTANCE.getBlock_Outline( );
		/**
		 * The meta object literal for the '<em><b>Background</b></em>' containment reference feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->