Bug 117148 Support Accessibility
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/attribute/util/AttributeValidator.java
case AttributePackage.LEGEND_ITEM_TYPE_OBJECT :
				return validateLegendItemTypeObject( (LegendItemType) value,
						diagnostics,
						context );
			case AttributePackage.LINE_DECORATOR_OBJECT :
				return validateLineDecoratorObject( (LineDecorator) value,
						diagnostics,
						context );
			case AttributePackage.LINE_STYLE_OBJECT :
				return validateLineStyleObject( (LineStyle) value,
						diagnostics,
						context );
			case AttributePackage.MARKER_TYPE_OBJECT :
				return validateMarkerTypeObject( (MarkerType) value,
						diagnostics,
						context );
			case AttributePackage.ORIENTATION_OBJECT :
				return validateOrientationObject( (Orientation) value,
						diagnostics,
						context );
			case AttributePackage.PERCENTAGE :
				return validatePercentage( ( (Double) value ).doubleValue( ),
						diagnostics,
						context );
			case AttributePackage.PERCENTAGE_OBJECT :
				return validatePercentageObject( (Double) value,
						diagnostics,
						context );
			case AttributePackage.POSITION_OBJECT :
				return validatePositionObject( (Position) value,