06.test

<<< native
[ EUnderover
    True
    (ESymbol Op "\8721")
    (EGrouped [ EIdentifier "m" , ESymbol Rel "=" , ENumber "1" ])
    (ESymbol Ord "\8734")
, EUnderover
    True
    (ESymbol Op "\8721")
    (EGrouped [ EIdentifier "n" , ESymbol Rel "=" , ENumber "1" ])
    (ESymbol Ord "\8734")
, EFraction
    NormalFrac
    (EGrouped
       [ ESuper (EIdentifier "m") (ENumber "2")
       , ESpace (1 % 6)
       , EIdentifier "n"
       ])
    (EGrouped
       [ ESuper (ENumber "3") (EIdentifier "m")
       , EDelimited
           "("
           ")"
           [ Right (EIdentifier "m")
           , Right (ESpace (1 % 6))
           , Right (ESuper (ENumber "3") (EIdentifier "n"))
           , Right (ESymbol Bin "+")
           , Right (EIdentifier "n")
           , Right (ESpace (1 % 6))
           , Right (ESuper (ENumber "3") (EIdentifier "m"))
           ]
       ])
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <munderover>
      <mo>∑</mo>
      <mrow>
        <mi>m</mi>
        <mo>=</mo>
        <mn>1</mn>
      </mrow>
      <mo accent="false">∞</mo>
    </munderover>
    <munderover>
      <mo>∑</mo>
      <mrow>
        <mi>n</mi>
        <mo>=</mo>
        <mn>1</mn>
      </mrow>
      <mo accent="false">∞</mo>
    </munderover>
    <mfrac>
      <mrow>
        <msup>
          <mi>m</mi>
          <mn>2</mn>
        </msup>
        <mspace width="0.167em" />
        <mi>n</mi>
      </mrow>
      <mrow>
        <msup>
          <mn>3</mn>
          <mi>m</mi>
        </msup>
        <mrow>
          <mo stretchy="true" form="prefix">(</mo>
          <mi>m</mi>
          <mspace width="0.167em" />
          <msup>
            <mn>3</mn>
            <mi>n</mi>
          </msup>
          <mo>+</mo>
          <mi>n</mi>
          <mspace width="0.167em" />
          <msup>
            <mn>3</mn>
            <mi>m</mi>
          </msup>
          <mo stretchy="true" form="postfix">)</mo>
        </mrow>
      </mrow>
    </mfrac>
  </mrow>
</math>