texmath-0.12.5: test/writer/mml/mfracSinheritance14.test

<<< native
[ EFraction
    NormalFrac
    (EFraction
       NormalFrac
       (ENumber "1")
       (EGrouped [ EIdentifier "y" , ESymbol Bin "+" , ENumber "3" ]))
    (EGrouped [ EIdentifier "y" , ESymbol Bin "+" , ENumber "3" ])
, EFraction
    NormalFrac
    (ENumber "1")
    (EGrouped [ EIdentifier "y" , ESymbol Bin "+" , ENumber "3" ])
, EFraction
    NormalFrac
    (EFraction
       NormalFrac
       (ENumber "1")
       (EGrouped [ EIdentifier "y" , ESymbol Bin "+" , ENumber "3" ]))
    (EGrouped [ EIdentifier "y" , ESymbol Bin "+" , ENumber "3" ])
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mfrac>
      <mfrac>
        <mn>1</mn>
        <mrow>
          <mi>y</mi>
          <mo>+</mo>
          <mn>3</mn>
        </mrow>
      </mfrac>
      <mrow>
        <mi>y</mi>
        <mo>+</mo>
        <mn>3</mn>
      </mrow>
    </mfrac>
    <mfrac>
      <mn>1</mn>
      <mrow>
        <mi>y</mi>
        <mo>+</mo>
        <mn>3</mn>
      </mrow>
    </mfrac>
    <mfrac>
      <mfrac>
        <mn>1</mn>
        <mrow>
          <mi>y</mi>
          <mo>+</mo>
          <mn>3</mn>
        </mrow>
      </mfrac>
      <mrow>
        <mi>y</mi>
        <mo>+</mo>
        <mn>3</mn>
      </mrow>
    </mfrac>
  </mrow>
</math>