<?xml version='1.0'?>

<example>
    <OMOBJ xmlns="http://www.openmath.org/OpenMath" version="2.0">
       <OMA>
          <OMS name="diff" cd="math4all"/>
          <OMV name="s"/>
          <OMV name="t"/>
       </OMA>
    </OMOBJ>
</example>
