rec-mlabeledtr.test

<<< native
[ EArray
    [ AlignCenter ]
    [ [ [ EGrouped
            [ EIdentifier "E"
            , ESymbol Rel "="
            , EGrouped
                [ EIdentifier "m"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "c") (ENumber "2")
                ]
            ]
        ]
      ]
    ]
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mtable>
    <mtr>
      <mtd columnalign="center" style="text-align: center">
        <mrow>
          <mi>E</mi>
          <mo>=</mo>
          <mrow>
            <mi>m</mi>
            <mi>&#8290;</mi>
            <msup>
              <mi>c</mi>
              <mn>2</mn>
            </msup>
          </mrow>
        </mrow>
      </mtd>
    </mtr>
  </mtable>
</math>