MathML is a xml format created in 1998.
| #2940on PLDB | 28Years Old |
<?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>⁢</mo> <msup><mi>x</mi><mn>2</mn></msup>
<mo>+</mo><mi>b</mi><mo>⁢</mo><mi>x</mi>
<mo>+</mo><mi>c</mi>
</mrow>
</math>