[Attribute] format [Required] No [Description] 
The format of the file or resource. The values are "properties" or "xml". If the value is "properties" the file/resource is a property file contains name to classname pairs. If the value is "xml", the file/resource is an xml file/resource structured according to Antlib. The default is "properties" unless the file/resource name ends with ".xml", in which case the format attribute will have the value "xml". since Apache Ant 1.6