  For the integrable spin-s XXZ chain we express explicitly any given spin-$s$
form factor in terms of a sum over the scalar products of the spin-1/2
operators. Here they are given by the operator-valued matrix elements of the
monodromy matrix of the spin-1/2 XXZ spin chain. In the paper we call an
arbitrary matrix element of a local operator between two Bethe eigenstates a
form factor of the operator. We derive all important formulas of the fusion
method in detail. We thus revise the derivation of the higher-spin XXZ form
factors given in a previous paper. The revised method has several interesting
applications in mathematical physics. For instance, we express the spin-$s$ XXZ
correlation function of an arbitrary entry at zero temperature in terms of a
sum of multiple integrals.
