<<< native
[ ESubsup
    (EIdentifier "X")
    (ESubsup (EIdentifier "Z") (ENumber "4") (ENumber "3"))
    (ESubsup (EIdentifier "Y") (ENumber "2") (ENumber "1"))
, ESymbol Rel "="
, ESubsup
    (EIdentifier "X")
    (ESubsup (EIdentifier "Z") (ENumber "4") (ENumber "3"))
    (ESubsup (EIdentifier "Y") (ENumber "2") (ENumber "1"))
]
>>> omml
<?xml version='1.0' ?>
<m:oMathPara>
  <m:oMathParaPr>
    <m:jc m:val="center" />
  </m:oMathParaPr>
  <m:oMath>
    <m:sSubSup>
      <m:e>
        <m:r>
          <m:t>X</m:t>
        </m:r>
      </m:e>
      <m:sub>
        <m:sSubSup>
          <m:e>
            <m:r>
              <m:t>Z</m:t>
            </m:r>
          </m:e>
          <m:sub>
            <m:r>
              <m:t>4</m:t>
            </m:r>
          </m:sub>
          <m:sup>
            <m:r>
              <m:t>3</m:t>
            </m:r>
          </m:sup>
        </m:sSubSup>
      </m:sub>
      <m:sup>
        <m:sSubSup>
          <m:e>
            <m:r>
              <m:t>Y</m:t>
            </m:r>
          </m:e>
          <m:sub>
            <m:r>
              <m:t>2</m:t>
            </m:r>
          </m:sub>
          <m:sup>
            <m:r>
              <m:t>1</m:t>
            </m:r>
          </m:sup>
        </m:sSubSup>
      </m:sup>
    </m:sSubSup>
    <m:r>
      <m:rPr>
        <m:sty m:val="p" />
      </m:rPr>
      <m:t>=</m:t>
    </m:r>
    <m:sSubSup>
      <m:e>
        <m:r>
          <m:t>X</m:t>
        </m:r>
      </m:e>
      <m:sub>
        <m:sSubSup>
          <m:e>
            <m:r>
              <m:t>Z</m:t>
            </m:r>
          </m:e>
          <m:sub>
            <m:r>
              <m:t>4</m:t>
            </m:r>
          </m:sub>
          <m:sup>
            <m:r>
              <m:t>3</m:t>
            </m:r>
          </m:sup>
        </m:sSubSup>
      </m:sub>
      <m:sup>
        <m:sSubSup>
          <m:e>
            <m:r>
              <m:t>Y</m:t>
            </m:r>
          </m:e>
          <m:sub>
            <m:r>
              <m:t>2</m:t>
            </m:r>
          </m:sub>
          <m:sup>
            <m:r>
              <m:t>1</m:t>
            </m:r>
          </m:sup>
        </m:sSubSup>
      </m:sup>
    </m:sSubSup>
  </m:oMath>
</m:oMathPara>