Is the polarized light flavor sea-quark asymmetric?

Simple formulas on $\Delta\bar d(x)-\Delta\bar u(x)$ are proposed for extracting their values from polarized deep-inelastic semi-inclusive data. The present SMC and HERMES data suggest that $\Delta\bar d(x)-\Delta\bar u(x)$ is slightly negative, though the precision of the data is not enough for confirming it.