D-xylose(out) + H(+)(out) => D-xylose(in) + H(+)(in)
d-xylose(out) + h(+)(out) => d-xylose(in) + h(+)(in)
D-xylose(out) + H(+)(out) => D-xylose(in) + H(+)(in)
d-xylose(out) + h(+)(out) => d-xylose(in) + h(+)(in)