Rigging without skinning is totally useless. Only the skinning information gives a relation between the bones (the rig) and the actual mesh (the skin). If a rig isn't skinned it just consists of invisible bones which can be animated but have no influence on the Mesh around.
So if you want to use [skeletal animations][1] your model need to be rigged and skinned.
[1]: http://en.wikipedia.org/wiki/Skeletal_animation
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