Document CCK hooks for Doxygen parsing

There is doxygen documentation for CCK: http://drupalcontrib.org/api/file/contributions/cck/content.module/6

However, there's no documentation for hooks defined by CCK. Could we keep a PHP file in the CCK directory that exists only to provide hook documentation that can be parsed by Doxygen?

Changing title.

Maybe CCK could include files such as in Views docs subdirectory with a format similar to:

http://cvs.drupal.org/viewvc.py/drupal/contributions/docs/developer/hook...

These could be located in places such as:

- cck/docs/hooks.php
- cck/modules/fieldgroup/docs/hooks.php
- etc.