yum --allow-downgrade syntax

Hi,
I've googled, I've read the help, I've read the wiki, I've even read the source 
code, and I just cannot figure out the syntax to the allow-downgrade plugin.
Actually, through all my googling, I haven't actually read of anyone actually 
using it successfully.  Which rather blows my mind.

Anyway, what is the correct syntax?

For those that are curious ... the main code is shorter than this e-mail 
message, in case it helps.

def postresolve_hook(conduit):
     opts, args = conduit.getCmdLine()
     if opts.allow_downgrade:
         tsInfo = conduit.getTsInfo()
         tsInfo.probFilterFlags.append(RPMPROB_FILTER_OLDPACKAGE)

I would file a bugzilla ... but for all I know, it's working correctly.
Thanks
Troy
-- 
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Troy Dawson  [email protected]  (630)840-6468
Fermilab  ComputingDivision/LCSI/CSI DSS Group
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