| Attribute | Type | Description | Required | 
        
          | name | string | Name of the package to reference. Multiple package can be specified with a single element as a semi-colon separated list of package names. | True | 
        
          | if | bool | Indicates if the package should be passed to the task. If true then the package will be passed; otherwise, skipped. The default is true. | False | 
        
          | unless | bool | Indicates if the package should not be passed to the task. If false then the package will be passed; otherwise, skipped. The default is false. | False |