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We present new expressions of form factors of the XXZ model which satisfySmirnov's three axioms. These new form factors are obtained by acting theaffine quantum group $U_q (\hat{\frak s \frak l_2})$ to the known ones obtainedin our previous works. We also find the relations among all the new and knownform factors, i.e., all other form factors can be expressed as kind ofdescendents of a special one.Comment: 11 pages, latex; Some explanation is adde

Form factors of theXXZmodel and the affine quantum group symmetry