Classical bound states of solitons ("breathers") in continuum spin chains a
re semiclassically quantized via Berry's phase. Remarkably, our results at
zone center and zone boundary as well as the whole continuum match the exac
t Bethe ansatz result of the discrete, XYZ spin-1/2 chain with arbitrary an
isotropies. (C) 1999 American Institute of Physics. [S0021-8979(99)75808-1]
.