| name | the name of the variable to set | No | 
    | value | the value of the variable to set | Yes when using the name attribute | 
    | file | the filename of the property file to load as ivy variables | One of these, when not using the name attribute | 
    | url | the url from which to read ivy variables | 
    | prefix | Prefix to apply to variables. A "." is appended to the prefix if not specified. | No | 
    | settingsRef | A reference to the ivy settings that must be used by this task (since 2.0) | No, 'ivy.instance' is taken by default. |