I doubt if I will be available for the meeting you mentioned.
provides a formal elucidation of the tree structure in any math expression in its author-level XML document type. My project
provides a didactic example. In the didactic production system there's also another formal elucidation of the math tree structure for each math expression in the spawned HTML-with-MathML output, but the latter involves only the less expressive vocabulary of presentation MathML whereas the former has a vocabulary (for element names) that is close to the command vocabulary for LaTeX. (Of course, the MathML there could be enriched using MathML <semantics> to refer back to LaTeX-like names.)
I have not provided a good tuning of my didactic author-level XML for use of the blind, but I think it should not be far away for someone who wants to do that.
In my talk at TUG 2014
I spoke about the possibilities for direct "viewing" of (a tuning of) my didactic author-level XML in a web browser using only CSS.
Thank you for providing this focus.
A math formula has a tree structure, as does the source code for a computer program. There's a shared interest in navigating complex trees. Particularly the blind math people who prefer to read math via the LaTeX source file.