<?xml version="1.0" encoding="UTF-8"?>
<grammar datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes" xmlns="http://relaxng.org/ns/structure/1.0" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:xlink="http://www.w3.org/1999/xlink" ns="http://www.w3.org/1998/Math/MathML">
  <include href="mathml2-main.rng"/>
  <start>
    <choice>
      <ref name="mathml.math"/>
    </choice>
  </start>
</grammar>
