lvm logical volume paths

hi all,  

my apologies if this is a stupid question. this relates to a Red Hat Enterprise Linux Server 2.6.18-8.el5xen installation (i know bits and pieces about linux, but have much to still learn).  

why, when i cat fstab, do i get this:  

# cat /etc/fstab
...
...

/dev/VolGroup00/data1   /data1                  ext3    defaults
1 2
/dev/VolGroup00/data2   /data2                  ext2    defaults

but when doing df i get "mapper" included in the output.  

# df -h
Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-data1

                      473G  198M  449G   1% /data1
/dev/mapper/VolGroup00-data2
                      473G   70M  449G   1% /data2

i'd appreciate your insights.

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