Bug 117148 Support Accessibility
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/attribute/impl/AttributeFactoryImpl.java
case AttributePackage.RGB_VALUE :
				return convertRGBValueToString( eDataType, instanceValue );
			case AttributePackage.RGB_VALUE_OBJECT :
				return convertRGBValueObjectToString( eDataType, instanceValue );
			case AttributePackage.RISER_TYPE_OBJECT :
				return convertRiserTypeObjectToString( eDataType, instanceValue );
			case AttributePackage.RULE_TYPE_OBJECT :
				return convertRuleTypeObjectToString( eDataType, instanceValue );
			case AttributePackage.SCALE_UNIT_TYPE_OBJECT :
				return convertScaleUnitTypeObjectToString( eDataType,
						instanceValue );
			case AttributePackage.SORT_OPTION_OBJECT :
				return convertSortOptionObjectToString( eDataType,
						instanceValue );
			case AttributePackage.STRETCH_OBJECT :
				return convertStretchObjectToString( eDataType, instanceValue );
			case AttributePackage.STYLED_COMPONENT_OBJECT :
				return convertStyledComponentObjectToString( eDataType,
						instanceValue );
			case AttributePackage.TICK_STYLE_OBJECT :
				return convertTickStyleObjectToString( eDataType, instanceValue );
			case AttributePackage.TRIGGER_CONDITION_OBJECT :
				return convertTriggerConditionObjectToString( eDataType,
						instanceValue );
			case AttributePackage.TRIGGER_FLOW_OBJECT :
				return convertTriggerFlowObjectToString( eDataType,
						instanceValue );
			case AttributePackage.UNITS_OF_MEASUREMENT_OBJECT :
				return convertUnitsOfMeasurementObjectToString( eDataType,
						instanceValue );