| Name | Meaning | 
| native_format | The native pathname format. | 
| generic_format | The generic pathname format. | 
| auto_format | The interpretation of the format of the character sequence is
  implementation-defined. The implementation may inspect the content of the character sequence to
  determine the format. Recommended practice: For POSIX-based systems, native and generic formats are equivalent
  and the character sequence should always be interpreted in the same way. |