texmath-0.13.1.2: test/writer/mml/msubsup-06.test

<<< native
[ ESubsup
    (EIdentifier "X")
    (ESubsup (EIdentifier "Z") (ENumber "4") (ENumber "3"))
    (ESubsup (EIdentifier "Y") (ENumber "2") (ENumber "1"))
, ESymbol Rel "="
, ESubsup
    (EIdentifier "X")
    (ESubsup (EIdentifier "Z") (ENumber "4") (ENumber "3"))
    (ESubsup (EIdentifier "Y") (ENumber "2") (ENumber "1"))
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <msubsup>
      <mi>X</mi>
      <msubsup>
        <mi>Z</mi>
        <mn>4</mn>
        <mn>3</mn>
      </msubsup>
      <msubsup>
        <mi>Y</mi>
        <mn>2</mn>
        <mn>1</mn>
      </msubsup>
    </msubsup>
    <mo>=</mo>
    <msubsup>
      <mi>X</mi>
      <msubsup>
        <mi>Z</mi>
        <mn>4</mn>
        <mn>3</mn>
      </msubsup>
      <msubsup>
        <mi>Y</mi>
        <mn>2</mn>
        <mn>1</mn>
      </msubsup>
    </msubsup>
  </mrow>
</math>