texmath-0.12.5: test/writer/mml/stretchVert2.test

<<< native
[ EDelimited
    "|"
    ""
    [ Right (EIdentifier "H")
    , Left "|"
    , Right (ESymbol Bin "+")
    , Right
        (EDelimited
           "\10216"
           "\10217"
           [ Right (EIdentifier "H")
           , Right (ESymbol Rel "\8739")
           , Right (EIdentifier "H")
           ])
    ]
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mo stretchy="true" form="prefix">|</mo>
    <mi>H</mi>
    <mo stretchy="true" form="infix">|</mo>
    <mo>+</mo>
    <mrow>
      <mo stretchy="true" form="prefix">⟨</mo>
      <mi>H</mi>
      <mo>∣</mo>
      <mi>H</mi>
      <mo stretchy="true" form="postfix">⟩</mo>
    </mrow>
  </mrow>
</math>