[Attribute] onerror [Required] No [Description] 
The action to take if there was a failure in defining the type. The values are fail: cause a build exception; report: output a warning, but continue; ignore: do nothing. since Ant 1.6 An additional value is failall: cause all behavior of fail, as well as a build exception for the resource or file attribute if the resource or file is not found. since Ant 1.7 The default is fail.