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

<<< native
[ EBoxed
    (EGrouped
       [ ESuper (EIdentifier "x") (ENumber "2")
       , ESymbol Bin "+"
       , ESuper (EIdentifier "y") (ENumber "2")
       , ESymbol Bin "+"
       , ESuper (EIdentifier "z") (ENumber "2")
       ])
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <menclose notation="box">
    <mrow>
      <msup>
        <mi>x</mi>
        <mn>2</mn>
      </msup>
      <mo>+</mo>
      <msup>
        <mi>y</mi>
        <mn>2</mn>
      </msup>
      <mo>+</mo>
      <msup>
        <mi>z</mi>
        <mn>2</mn>
      </msup>
    </mrow>
  </menclose>
</math>