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Hi Denis,

While this might not be directly related to your proposal, you might find the following formula tree visualisation interesting: 
The displayed trees correspond to the semantically richer structure that my speech rule engine uses internally and that we use in MathJax to voice formulas.


Also, you might consider the \texttip and \mathtip macros in "action" extension for TeX input (if you are using TeX):

or the <maction actiontype="tooltip"> element if you are using MathML input.  These will display a tooltip when you hover over an element, so that might be what you need to expand variable names into longer descriptions.



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