mathDir.test

<<< mml
<?xml version="1.0" encoding="UTF-8"?>

<math xmlns="http://www.w3.org/1998/Math/MathML" dir="rtl">
  <mi>x</mi> 
  <mo>+</mo> 
  <mi>y</mi> </math>
>>> native
[ EIdentifier "x" , ESymbol Bin "+" , EIdentifier "y" ]