<!DOCTYPE informalequation
           PUBLIC "-//OASIS//DTD DocBook MathML Module V1.0//EN"
           "http://www.oasis-open.org/docbook/xml/mathml/1.0/dbmathml.dtd">
<informalequation>
<mml:math><mml:apply><mml:divide/></mml:apply></mml:math>
</informalequation>
