[CentOS] how to determine what's installed from a repository?

Hello all--

I am trying to determine what I have isntalled from a given repository.

I have seen several references to "yum repo-pkgs" which I think is what
would work for me, but  "repo-pkgs" does not seem to be a part of
yum 3.2.29. Is this a yum add on that I could get somewhere?

-- 
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MzK

"Way down deep, we're all motivated by
 the  same urges.  Cats have the courage
 to live by them."
                        -- Jim Davis