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
/**
		 * The meta object literal for the '{@link org.eclipse.birt.chart.model.layout.impl.BlockImpl <em>Block</em>}' class.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @see org.eclipse.birt.chart.model.layout.impl.BlockImpl
		 * @see org.eclipse.birt.chart.model.layout.impl.LayoutPackageImpl#getBlock()
		 * @generated
		 */
		EClass BLOCK = eINSTANCE.getBlock( );
		/**
		 * The meta object literal for the '<em><b>Children</b></em>' containment reference list feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EReference BLOCK__CHILDREN = eINSTANCE.getBlock_Children( );
		/**
		 * The meta object literal for the '<em><b>Bounds</b></em>' containment reference feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EReference BLOCK__BOUNDS = eINSTANCE.getBlock_Bounds( );
		/**
		 * The meta object literal for the '<em><b>Anchor</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute BLOCK__ANCHOR = eINSTANCE.getBlock_Anchor( );