handling of braille math and MathML

In the First Public Working Draft https://daisy.github.io/ebraille/published/1.0/FPWD-ebraille-20240725/
6.2.1 Character encoding MathML is mentionend in a Note to be embedded in eBraille.

This issue could also be related to Georgs Issue "TVI wants to see the original graphic and original math #32".

I think at some point we need to define best practice for handling of Math formulas (if I didn't miss it and some of you already did this?)

Ideally I think we should put the braille math in the braille rendition and add an ink print rendition of the eBraille book that contains the same formula in MathML (and maybe also an image of the formula). The single line display user can continue reading the math formula in the braille rendition without further requirements to the reading system. But an advanced reading system could switch between the two renditions if it is required by the user to use an optical/graphical/tactical representation of the math formula.

Start by reading section 6.2.1 of the linked First Public Working Draft and compare it with the related issue #32. The issue is done when the project agrees on and documents a best practice for representing braille math and MathML across renditions.

Written by the indexing model from the issue text.