
<!DOCTYPE math
  PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<math xmlns="http://www.w3.org/1998/Math/MathML">
<apply>
  <imaginary/>
  <apply><plus/>
    <ci> x </ci>
    <apply><times/>
      <cn> &amp;ImaginaryI; </cn>
      <ci> y </ci>
    </apply>
  </apply>
</apply>
</math>