Example: Frame

   latitude    type:      real
               range:     (-90.0 90.0)
   longitude   type:      real
               range:     (-180.0 180.0)
   x-velocity  type:      real
   y-velocity  type:      real
   speed       type:      real
               if-needed: ship-speed-fn

If we wish to have an action speedup that doubles the velocities of the ship, it will have to be separate from the frame definition, since it is not associated with a slot.

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