MathML -- Exemple

<math>
  <msup>
    <mi>x</mi>
    <mn>2</mn>
  </msup>
  <mo>+</mo>
  <mn>1</mn>
</math>

<apply>
   <plus/>
   <apply>
       <power/>
       <ci>x</ci>
       <cn>2</cn>
   </apply>
   <cn>1</cn>
 </apply>