[CentOS] Partition labelling

When doing a network install with a kickstart file, how do I prevent
the partition label on the root filesystem from being changed?  I'm
building a system with multiple flavors of CentOS in separate
partitions and I would really like to have the partition labels be
something meaningful.

So far, the only idea I've come up with is to use the --noformat flag
on the partition definintion in the kick start file and then format it
in the %pre section.