<?xml version="1.0"?>
<!DOCTYPE html PUBLIC
  "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN"
  "http://www.w3.org/TR/MathML2/dtd/xhtml-math11-f.dtd"
[
  <!ENTITY mathml "http://www.w3.org/1998/Math/MathML">
]>

<!-- This Source Code Form is subject to the terms of the Mozilla Public
   - License, v. 2.0. If a copy of the MPL was not distributed with this
   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>Simple Document with MathML</title>
</head>
<body>

<math xmlns="http://www.w3.org/1998/Math/MathML">
<mrow>
   <mi>x</mi>
   <mo>=</mo>
   <mi>y</mi>
   <mo>+</mo>
   <mfrac>
      <mi>a</mi>
      <mi>b</mi>
   </mfrac>
</mrow>
</math>

</body>
</html>
