Generic symbol problems

I would like to produce content MathML equivalent to the following
LaTeX:

$/{x_1,\ldots ,x_n/}$

I have the following attempt:

  <math>
    <set>
      <bvar>
        <ci><msub>
          <mi>x</mi>
          <mi>i</mi>
        </msub></ci>
      </bvar>
      <condition>
        <apply>
          <and/>
          <apply>
            <leq/><cn>1</cn><ci>i</ci>
          </apply>
          <apply>
            <leq/><ci>i</ci><ci>n</ci>
          </apply>
          <apply>
            <in/><ci> i </ci><integers/>
          </apply>
        </apply>
      </condition>
    </set>
  </math>

however I am not happy with the implied assumption that <ci>i</ci> is
the same as <mi>i</mi>. I would be glad to here if anyone has any
ideas or solutions with regard to this problem,

regards,

Bill Naylor.