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
* @return the meta object for the containment reference '<em>Outline</em>'.
	 * @see org.eclipse.birt.chart.model.layout.Block#getOutline()
	 * @see #getBlock()
	 * @generated
	 */
	EReference getBlock_Outline( );
	/**
	 * Returns the meta object for the containment reference '{@link org.eclipse.birt.chart.model.layout.Block#getBackground <em>Background</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for the containment reference '<em>Background</em>'.
	 * @see org.eclipse.birt.chart.model.layout.Block#getBackground()
	 * @see #getBlock()
	 * @generated
	 */
	EReference getBlock_Background( );
	/**
	 * Returns the meta object for the attribute '{@link org.eclipse.birt.chart.model.layout.Block#isVisible <em>Visible</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for the attribute '<em>Visible</em>'.
	 * @see org.eclipse.birt.chart.model.layout.Block#isVisible()
	 * @see #getBlock()
	 * @generated
	 */
	EAttribute getBlock_Visible( );
	/**
	 * Returns the meta object for the containment reference list '{@link org.eclipse.birt.chart.model.layout.Block#getTriggers <em>Triggers</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for the containment reference list '<em>Triggers</em>'.
	 * @see org.eclipse.birt.chart.model.layout.Block#getTriggers()
	 * @see #getBlock()