how to tell the difference between "redhat" and "fedora" distributions

[Nielsen, Steve]

I want to be able to tell the difference between a real redhat distribution:

        redhat 7.3
        redhat enterprise ....

and Fedora (I know its really from redhat).

Currently, I am on Fedora Core 2 and both "redhat" and "fedora" are defined (as 
well as "fedora_2"). There does not appear to be a distribution flavor variable 
defined where I can easily discern between redhat and fedora. I know I can do 
the following:

fedora::
        i_am_fedora = ( yes )
redhat.!fedora::
        i_am_redhat = ( yes )

but that is clunky. Is there a better way? Or can we add a "distribution" or 
flavor special variable or defined class?

I want to be able to say (minus the clunkiness):

fedora::
        ....
redhat::
        ....

Thanks,
Steve