2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/145783We consider semi-inclusive unpolarized DIS for the production of charged Kaons and the different possibilities, both in LO and NLO, to test the conventionally used assumptions s-\bar s=0, Δs-Δ\bar s=0 and D_d^{K+ - K-}=0. The considered tests have the advantage that they do not require any knowledge of the fragmentation functions.this is a talk given at the XII Workshop On High Energy Spin Physics (DSPIN-07), September 3--7, 2007 at JINR, Dubna, Russia, 4 pages. to appear in the proceedings of the workshopHigh Energy Physics - Phenomenologytext