\usemodule[mathml,mathml-html]

\startbuffer
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/mathml2.dtd">

<math xmlns="http://www.w3.org/1998/Math/MathML">
    <mrow>
        <mi>a</mi>
        <mo>&InvisibleTimes;</mo>
        <msup>
            <mi>x</mi>
            <mn>2</mn>
        </msup>
        <mo>+</mo>
        <mi>b</mi>
        <mo>&InvisibleTimes; </mo>
        <mi>x</mi>
        <mo>+</mo>
        <mi>c</mi>
    </mrow>
    <mtext> (<b>quadratic</b> equation)</mtext>
</math>
\stopbuffer

\starttext
    \processxmlbuffer
\stoptext
