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Recent experiments by the HERMES group at HERA are measuring semi-inclusiveelectroproduction of pions from deuterium. We point out that by comparing theproduction of $\pi^+$ and $\pi^-$ from an isoscalar target, it is possible, inprinciple, to measure charge symmetry violation in the valence quarkdistributions of the nucleons. It is also possible in the same experiments toobtain an independent measurement of the quark fragmentation functions. Wereview the information which can be deduced from such experiments and show the``signature'' for charge symmetry violation in such experiments. Finally, wepredict the magnitude of the charge symmetry violation, from both the valencequark distributions and the pion fragmentation function, which might beexpected in these experiments.Comment: 19 pages plus 5 figures, used eps

Probing charge-symmetry-violating quark distributions in semi-inclusive leptoproduction of hadrons