texmath-0.13: test/writer/mml/mo6.test

<<< native
[ EMathOperator "there exists"
, EGrouped
    [ EGrouped [ EIdentifier "\948" , ESymbol Rel ">" , ENumber "0" ]
    , EMathOperator "such that"
    , EGrouped
        [ EGrouped
            [ EIdentifier "f"
            , ESymbol Ord "\8289"
            , EDelimited "(" ")" [ Right (EIdentifier "x") ]
            ]
        , ESymbol Rel "<"
        , ENumber "1"
        ]
    ]
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mrow>
      <mi mathvariant="normal">there exists</mi>
      <mo>&#8289;</mo>
    </mrow>
    <mrow>
      <mrow>
        <mi>δ</mi>
        <mo>&gt;</mo>
        <mn>0</mn>
      </mrow>
      <mrow>
        <mi mathvariant="normal">such that</mi>
        <mo>&#8289;</mo>
      </mrow>
      <mrow>
        <mrow>
          <mi>f</mi>
          <mo>&#8289;</mo>
          <mrow>
            <mo stretchy="true" form="prefix">(</mo>
            <mi>x</mi>
            <mo stretchy="true" form="postfix">)</mo>
          </mrow>
        </mrow>
        <mo>&lt;</mo>
        <mn>1</mn>
      </mrow>
    </mrow>
  </mrow>
</math>