
<!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>
  <approx/>
  <cn type="rational"> 22 <sep/> 7 </cn>
  <cn type="constant"> &amp;pi; </cn>
</apply>
</math>