data/pom/15.xml
<?xml version="1.0" ?>
<math type="pom-exported">
<expression prime-tag="sequence">
<term prime-tag="alphanumeric">bx</term>
<term prime-tag="minus">-</term>
<term prime-tag="letter" secondary-tags="Latin">x</term>
<expression prime-tag="caret" secondary-tags="superscript_operation">
<term prime-tag="digit" secondary-tags="numeric">2</term>
</expression>
</expression>
</math>