merrorB3.mml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE math PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/xhtml-math11-f.dtd">

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <merror>
    <mtext>Unrecognized element: &lt;mfraction&gt;arguments were:</mtext> 
    <mrow>
      <mn>1</mn> 
      <mo>+</mo> 
      <msqrt>
        <mn>5</mn> 
      </msqrt> 
    </mrow> 
    <mtext> &#x0205F;and &#x0205F;</mtext> 
    <mn>2</mn> 
  </merror> </math>