[Yum] local "base"?

[Morgan Read]

Hi,
If I set up a local repo with the FC3 dvd mounted in it, can I then use 
it as my "[base]" "baseurl" (with Internet mirrors or not?  Does 
createrepo provide all the xml meta stuff necessary for doing 
groupinstall, etc. straight from the mounted dvd distro?

(I notice .../dvd/Fedora/RPMS has 1653 pkgs cf. 
ftp.wicks.co.nz:21/pub/linux/dist/fedora/3/i386/os/Fedora/RPMS which has 
688 pkgs - is this normal?)

Regards,
Morgan.