Bug 117148 Support Accessibility
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/attribute/util/AttributeValidator.java
case AttributePackage.LINE_STYLE :
				return validateLineStyle( (LineStyle) value,
						diagnostics,
						context );
			case AttributePackage.MARKER_TYPE :
				return validateMarkerType( (MarkerType) value,
						diagnostics,
						context );
			case AttributePackage.ORIENTATION :
				return validateOrientation( (Orientation) value,
						diagnostics,
						context );
			case AttributePackage.POSITION :
				return validatePosition( (Position) value, diagnostics, context );
			case AttributePackage.RISER_TYPE :
				return validateRiserType( (RiserType) value,
						diagnostics,
						context );
			case AttributePackage.RULE_TYPE :
				return validateRuleType( (RuleType) value, diagnostics, context );
			case AttributePackage.SCALE_UNIT_TYPE :
				return validateScaleUnitType( (ScaleUnitType) value,
						diagnostics,
						context );
			case AttributePackage.SORT_OPTION :
				return validateSortOption( (SortOption) value,
						diagnostics,
						context );
			case AttributePackage.STRETCH :
				return validateStretch( (Stretch) value, diagnostics, context );