[Name] data [Required] false [Attribute Constraints] This attribute may not be specified in conjunction with inline content [Type] ECMAScript Expression [Default Value] none [Description] 
An ECMAScript expression which returns a character string that indicates the type of event being generated. The event type may include alphanumeric characters and the "." (dot) character. The first character may not be a dot or a digit. Event type names are case-insensitive. If neither the data attribute or inline content is specified, an error.fetch event will be thrown. If used in conjunction with the inline content, an error.fetch will be thrown.