>>Actually, I didn't clarify that properly. I meant find which package owns it
>>when you don't have it installed. I believe all 3 of those require having
>>the RPM.
> 
> 
> About four years ago I started making a database of files as associated
> with different packages. I had hoped to be able search for a file and then
> see what packages it is a part of (for many packaging systems). I never
> finished. Does anyone know of similar?

You mean like rpmfind.net?  you can type in the name of an RPM package or a path 
to a file and it will tell you what packages it is part of.