  We report a measurement of the inclusive semileptonic branching fraction of
the B_s meson using data collected with the BaBar detector in the
center-of-mass (CM) energy region above the Upsilon(4S) resonance. We use the
inclusive yield of phi mesons and the phi yield in association with a
high-momentum lepton to perform a simultaneous measurement of the semileptonic
branching fraction and the production rate of B_s mesons relative to all B
mesons as a function of CM energy. The inclusive semileptonic branching
fraction of the B_s meson is determined to be B(B_s to l nu X)=9.5
(+2.5/-2.0)(stat)(+1.1/-1.9)(syst)%, where l indicates the average of e and mu.
