[Yum] Yum/rpm dependency list

[Jason Kim]

Is there any way (either with yum, rpm, or their backend modules) to provide a 
list of packages and groups and get back the actual dependency list that 
would need to be installed?

For instance, say I have a redhat system with only the 'base', 'core', and 
'admin-tools' groups installed (via kickstart and yum). Then someone comes 
along and installs the 'fortune' package (which isn't already installed, and 
which I don't want). I want to generate a list of all the rpms that *should* 
be installed, given my requirements, and compare that to the current list so 
I can remove the extraneous packages.

Thanks
-JayKim