commentarytag is used to provide supplementary commentary for exercises and their solutions. This commentary is associated with the exercise itself and may present itself in the form of a follow-up question, explanation, or variation of the exercise.
<exercise id="gravity-exercise"> <problem id="gravity-problem"> <para id="prob_1"> If a golf ball and a feather were dropped at the same time from 10 feet, which would strike the ground first? </para> </problem> <solution id="gravity-solution"> <para id="sol_1"> The golf ball would hit the ground first. </para> </solution> <commentary id="gravity-commentary" type="follow-up"> How would this problem have been different if the experiment was conducted in a vacuum? </commentary> </exercise>
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