Bad inference for mtable

[NSoiffer]

The following MathML gets inferred to be "lines". It shouldn't. You want to navigate and hear each column.

    <math>
      <mtable>
          <mtr><mtd><mi>a</mi></mtd><mtd><mi>b</mi></mtd><mtd><mi>c</mi></mtd></mtr>
          <mtr><mtd><mi>d</mi></mtd><mtd><mi>e</mi></mtd><mtd><mi>f</mi></mtd></mtr>
          <mtr><mtd><mi>g</mi></mtd><mtd><mi>h</mi></mtd><mtd><mi>i</mi></mtd></mtr>
      </mtable>
    </math>

If were a matrix or determinant, there would be some bracketing characters around it. The case of a "naked" mtable that should be read as a table probably isn't that common. Still, it would be nice to figure out a way to distinguish between this and something else that really is a "line".