msubsup-06.test

<<< mml
<?xml version="1.0" encoding="UTF-8"?>

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">  <msubsup>    <mi>X</mi>     <mrow>      <msubsup>        <mi>Z</mi>         <mn>4</mn>         <mn>3</mn>       </msubsup>     </mrow>     <mrow>      <msubsup>        <mi>Y</mi>         <mn>2</mn>         <mn>1</mn>       </msubsup>     </mrow>   </msubsup>   <mo>=</mo>   <msubsup>    <mrow>      <mi>X</mi>
    </mrow>     <mrow>      <msubsup>        <mrow>          <mi>Z</mi>
        </mrow>         <mrow>          <mn>4</mn>
        </mrow>         <mrow>          <mn>3</mn>
        </mrow>       </msubsup>     </mrow>     <mrow>      <msubsup>        <mrow>          <mi>Y</mi>
        </mrow>         <mrow>          <mn>2</mn>
        </mrow>         <mrow>          <mn>1</mn>
        </mrow>       </msubsup>     </mrow>   </msubsup> </math>
>>> 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"))
]