Parallel Markup
Raw PMathML
Enhanced PMathML
Content MathML
Maxima

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <semantics>
    <mi>&pi;</mi>
    <annotation-xml encoding="MathML-Content">
      <ci>&pi;</ci>
    </annotation-xml>
    <annotation encoding="SnuggleTeX">$\pi$</annotation>
    <annotation encoding="LaTeX">$\pi$</annotation>
    <annotation encoding="Maxima">%pi</annotation>
  </semantics>
</math>

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <semantics>
    <mi>&pi;</mi>
    <annotation encoding="SnuggleTeX">$\pi$</annotation>
  </semantics>
</math>

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mi>&pi;</mi>
</math>

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <ci>&pi;</ci>
</math>

%pi