texmath-0.12.5: test/writer/mml/mfrac-03.test

<<< native
[ EFraction
    NormalFrac
    (EIdentifier "A")
    (EGrouped
       [ EIdentifier "B"
       , ESymbol Bin "+"
       , EFraction
           NormalFrac
           (EIdentifier "C")
           (EGrouped
              [ EIdentifier "D"
              , ESymbol Bin "+"
              , EFraction NormalFrac (EIdentifier "E") (EIdentifier "F")
              ])
       ])
, ESymbol Rel "="
, EFraction
    NormalFrac
    (EOver False (EIdentifier "A") (EPhantom (ENumber "0")))
    (EGrouped
       [ EIdentifier "B"
       , ESymbol Bin "+"
       , EFraction
           NormalFrac
           (EIdentifier "C")
           (EGrouped
              [ EIdentifier "D"
              , ESymbol Bin "+"
              , EFraction
                  NormalFrac
                  (EIdentifier "E")
                  (EUnder False (EIdentifier "F") (EPhantom (ENumber "0")))
              ])
       ])
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mfrac>
      <mi>A</mi>
      <mrow>
        <mi>B</mi>
        <mo>+</mo>
        <mfrac>
          <mi>C</mi>
          <mrow>
            <mi>D</mi>
            <mo>+</mo>
            <mfrac>
              <mi>E</mi>
              <mi>F</mi>
            </mfrac>
          </mrow>
        </mfrac>
      </mrow>
    </mfrac>
    <mo>=</mo>
    <mfrac>
      <mover>
        <mi>A</mi>
        <mphantom>
          <mn>0</mn>
        </mphantom>
      </mover>
      <mrow>
        <mi>B</mi>
        <mo>+</mo>
        <mfrac>
          <mi>C</mi>
          <mrow>
            <mi>D</mi>
            <mo>+</mo>
            <mfrac>
              <mi>E</mi>
              <munder>
                <mi>F</mi>
                <mphantom>
                  <mn>0</mn>
                </mphantom>
              </munder>
            </mfrac>
          </mrow>
        </mfrac>
      </mrow>
    </mfrac>
  </mrow>
</math>