/dev/md/0 instead of /dev/md0 ?

[Glenn McGrath]

i notice in version.c of the current raidtools package it checks
/dev/md/0.

Is /dev/md/x (x=1..15)an alternative structure used on some
distributions, or is it an old way of doing things?

I just wondered as ive never seen the devices this way before.

Thanks

Glenn McGrath