Comment by Ygg2

Sorry, for the delay, here are some papers I read for that:

    * http://rtsys.informatik.uni-kiel.de/teaching/ws03-04/s-synth/papers/p33-petre.pdf 

    * http://www.cl.cam.ac.uk/~afb21/publications/VL96.html

The research I cited about lack of standard vocabulary of Symbols (like ASCII for text) comes from work that is not in English, and I can't find a version online. It makes intuitive and logical sense. A true visual language would parse images and have a standard sense of what symbols it may encounter.