Class should be a letter from A to G. class=ctr isn't correct; in South Africa you could probably assume that CTR and TMA are class C, but that won't necessarily apply to other locations.
Airspace type more-or-less defines the type of service provided by ATC (tower, FIS, area etc). Class defines to what extent it is provided and what traffic is allowed. I'll see if I can find you a nice document somewhere.
-- Glen
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