CentOS - Dec 2014 - No package group "X Window System" in CentOS 7.0?

Hi,

I'm currently experimenting with CentOS 7.0 in a few virtual guests, 
trying to install a reduced GNOME desktop as well as a minimal KDE 
desktop. I'm following this documentation:

http://www.dokuwiki.tachtler.net/doku.php?id=tachtler:centos_7_-_minimal_desktop_installation

I'm stuck at this point:

# yum groupinstall "X Window System"

Now I remember this from CentOS 5.x, when I began desktop installations 
with a minimal base system, then I added X11, configured it (using the 
minimal TWM), then added GNOME, then applications as needed.

Now there seems to be no more "X Window System" group. At least
'yum
grouplist' knows nothing about it.

Any suggestions?

Cheers,

Niki
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