| Attribute | Description | Type |
| if | Sets the property name for the 'if' condition. The argument will be ignored unless the property is defined. The value of the property is insignificant, but values that would imply misinterpretation ("false", "no") will throw an exception when evaluated. | String |
| location | Specifies relative location of argument on command line. "start" will place argument at start of command line, "mid" will place argument after all "start" arguments but before filenames, "end" will place argument after filenames. | LocationEnum |
| unless | Set the property name for the 'unless' condition. If named property is set, the argument will be ignored. The value of the property is insignificant, but values that would imply misinterpretation ("false", "no") of the behavior will throw an exception when evaluated. | String |
| value | Specifies the string that should appear on the command line. The argument will be quoted if it contains embedded blanks. Use multiple arguments to avoid quoting. | String |