| .. _nddata_io: | |
| I/O mixin | |
| ********* | |
| The I/O mixin, `~astropy.nddata.NDIOMixin`, adds ``read`` and ``write`` | |
| methods that us the astropy I/O registry. | |
| The mixin itself simply creates the read/write methods; it does not register | |
| any readers or writers with the I/O registry. Subclasses of | |
| `~astropy.nddata.NDDataBase` or `~astropy.nddata.NDData` need to include this | |
| mixin, implement a reader and writer, *and* register it with the I/O | |
| framework. See :ref:`io_registry` for details. | |