rec-semantics1

A basic of example of cerror

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <semantics>
    <mrow>
      <mrow>
        <mi>a</mi>
        <mfenced open="(" close=")">
          <mrow>
            <mi>x</mi>
            <mo>+</mo>
            <mn>5</mn>
          </mrow>
        </mfenced>
      </mrow>
    </mrow>
    <annotation-xml cd="mathmlkeys" name="contentequiv" encoding="MathML-Content">
      <apply>
        <ci>a</ci>
        <apply>
          <csymbol cd="arith1">plus</csymbol>
          <ci>x</ci>
          <cn>5</cn>
        </apply>
      </apply>
    </annotation-xml>
  </semantics>
</math>

Author: MathML 3.0