export /cdrom without mounting?

[reed at reedmedia.net]

The handbook at
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/network-nfs.html
shows exporting /cdrom.

The exports(5) man page seems to indicate a similar exports(5) entry will 
fail since /cdom is not mounted. And if the -alldirs option is not used it 
would just export the empty /cdrom directory (empty because not mounted).

So should the handbook say that /cdrom should be mounted first?

(Usually /cdrom mounted point is listed in /etc/fstab with "noauto".)