texmath-0.12.5: test/writer/mml/clipboard1.test

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