Bug 117149 Add additional datapoint markers
I would like to propose adding additional datapoint markers. Attached is a set of markers I would like supported.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/attribute/AttributePackage.java
* The meta object literal for the '<em><b>Delay</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute TOOLTIP_VALUE__DELAY = eINSTANCE.getTooltipValue_Delay( );
		/**
		 * The meta object literal for the '{@link org.eclipse.birt.chart.model.attribute.impl.URLValueImpl <em>URL Value</em>}' class.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @see org.eclipse.birt.chart.model.attribute.impl.URLValueImpl
		 * @see org.eclipse.birt.chart.model.attribute.impl.AttributePackageImpl#getURLValue()
		 * @generated
		 */
		EClass URL_VALUE = eINSTANCE.getURLValue( );
		/**
		 * The meta object literal for the '<em><b>Base Url</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute URL_VALUE__BASE_URL = eINSTANCE.getURLValue_BaseUrl( );
		/**
		 * The meta object literal for the '<em><b>Target</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute URL_VALUE__TARGET = eINSTANCE.getURLValue_Target( );
		/**