data/pom/301.xml
<?xml version="1.0" ?>
<math type="pom-exported">
<expression prime-tag="sequence">
<term prime-tag="operator">\nabla</term>
<term prime-tag="operation">\times</term>
<term prime-tag="letter" secondary-tags="Latin">E</term>
<term prime-tag="equals">=</term>
<term prime-tag="minus">-</term>
<expression prime-tag="fraction">
<expression prime-tag="sequence" secondary-tags="numerator">
<term prime-tag="operator">\partial</term>
<term prime-tag="letter" secondary-tags="Latin">B</term>
</expression>
<expression prime-tag="sequence" secondary-tags="denominator">
<term prime-tag="operator">\partial</term>
<term prime-tag="letter" secondary-tags="Latin">t</term>
</expression>
</expression>
</expression>
</math>