A basic of example of cerror
<math xmlns="http://www.w3.org/1998/Math/MathML">
<cerror>
<csymbol cd="aritherror">DivisionByZero</csymbol>
<apply>
<csymbol cd="arith1">divide</csymbol>
<ci>x</ci>
<cn>0</cn>
</apply>
</cerror>
</math>
Author: MathML 3.0