mfenced5.test

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

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mfenced open="[">
    <mn>0</mn> 
    <mn>1</mn> 
  </mfenced> </math>
>>> native
[ EDelimited
    "["
    ")"
    [ Right (EGrouped [ ENumber "0" , ESymbol Pun "," , ENumber "1" ])
    ]
]