msubsup1.test

<<< native
[ ESubsup (ESymbol Op "\8747") (ENumber "0") (ENumber "1")
, EGrouped
    [ ESuper (EIdentifier "\8519") (EIdentifier "x")
    , ESymbol Ord "\8290"
    , EGrouped [ ESymbol Ord "\8518" , EIdentifier "x" ]
    ]
]
>>> omml
<?xml version='1.0' ?>
<m:oMathPara>
  <m:oMathParaPr>
    <m:jc m:val="center" />
  </m:oMathParaPr>
  <m:oMath>
    <m:nary>
      <m:naryPr>
        <m:chr m:val="∫" />
        <m:limLoc m:val="subSup" />
        <m:subHide m:val="0" />
        <m:supHide m:val="0" />
      </m:naryPr>
      <m:sub>
        <m:r>
          <m:t>0</m:t>
        </m:r>
      </m:sub>
      <m:sup>
        <m:r>
          <m:t>1</m:t>
        </m:r>
      </m:sup>
      <m:e>
        <m:sSup>
          <m:e>
            <m:r>
              <m:t>ⅇ</m:t>
            </m:r>
          </m:e>
          <m:sup>
            <m:r>
              <m:t>x</m:t>
            </m:r>
          </m:sup>
        </m:sSup>
        <m:r>
          <m:rPr>
            <m:sty m:val="p" />
          </m:rPr>
          <m:t>&#8290;</m:t>
        </m:r>
        <m:r>
          <m:rPr>
            <m:sty m:val="p" />
          </m:rPr>
          <m:t>ⅆ</m:t>
        </m:r>
        <m:r>
          <m:t>x</m:t>
        </m:r>
      </m:e>
    </m:nary>
  </m:oMath>
</m:oMathPara>