evdev is the (relatively) new "generic input event" driver for X that supports all kinds of input devices. It's a completely different driver from the old keyboard and mouse drivers, so naturally it uses separate rules files.
evdev is much more flexible than the old drivers, and can more efficiently handle all the new multimedia keys that keyboards and mice have these days, as well as offering better support for things like hotplugging. If you used the new automatic configuration ability of X, chances are it would use the evdev driver.
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