<!ENTITY int "∫">
]>
-<m:math display="block" xmlns:m="http://www.w3.org/1998/Math/MathML">
+<m:math display="block" xmlns:helm="http://www.cs.unibo.it/helm" xmlns:m="http://www.w3.org/1998/Math/MathML">
<m:mrow helm:xref="SELECTION OK">
<m:mo>∫</m:mo>
<m:mo>⁡</m:mo>
<m:mfrac>
- <m:maction>
+ <m:maction actiontype="toggle">
<m:mtext>It's a secret!</m:mtext>
<m:mrow>
<m:mrow>
</m:mrow>
</m:maction>
<m:mrow>
- <m:msup>
+ <m:msup helm:xref="A">
<m:mi>x</m:mi>
<m:mn>2</m:mn>
</m:msup>
<m:mo>+</m:mo>
- <m:mrow>
+ <m:mrow helm:xref="B">
<m:mi>p</m:mi>
<m:mo>⁢</m:mo>
<m:mi>x</m:mi>