[Texmacs-dev] getting involved into to Scheme

[Immanuel Normann]

I'd like to get familiar with Scheme as TeXmacs extension language. I 
already know Scheme but not how it is used in TeXmacs and there is not 
to much documentation on it. Also I looked at the source 
TeXmacs/progs/... But then i decided to ask you where the best starting 
point is!

My interest is to figure out how much the already implemented features 
of TeXmacs Scheme are suited to manipulate the document in general.
Is there something comparable (planned) like a "Document Object Model" 
(as e.g. http://www.w3.org/DOM/ but adapted to Math content)?

A very simple case study that might illustrate the point:
Suppose I have several occurences of the function symbol "f" spread in 
the document. One of these occurences is may be within a definition. Now 
I want to click on this "f" and that should have the effect that all 
other occurences get red as backgroundcolor.

Is this doable with Scheme in TeXmacs?
How can I access nodes of the document tree? How do I change their 
appearence? How can I add or remove event listener to such a node?

Thanks for help,

Immanuel Normann