<<< native
[ ESub (EIdentifier "A") (EIdentifier "B")
, ESymbol Rel "="
, ESub (EIdentifier "A") (EIdentifier "B")
]
>>> omml
<?xml version='1.0' ?>
<m:oMathPara>
  <m:oMathParaPr>
    <m:jc m:val="center" />
  </m:oMathParaPr>
  <m:oMath>
    <m:sSub>
      <m:e>
        <m:r>
          <m:t>A</m:t>
        </m:r>
      </m:e>
      <m:sub>
        <m:r>
          <m:t>B</m:t>
        </m:r>
      </m:sub>
    </m:sSub>
    <m:r>
      <m:rPr>
        <m:sty m:val="p" />
      </m:rPr>
      <m:t>=</m:t>
    </m:r>
    <m:sSub>
      <m:e>
        <m:r>
          <m:t>A</m:t>
        </m:r>
      </m:e>
      <m:sub>
        <m:r>
          <m:t>B</m:t>
        </m:r>
      </m:sub>
    </m:sSub>
  </m:oMath>
</m:oMathPara>