African Writing Systems

http://www.library.cornell.edu/africana/Writing_Systems/Welcome.html
This site draws the context of writing systems which are being used in Africa. The major sections treats Syllographic, Alphabetic, Pictographic, Petrographic, Chromatographic and Philosophical Systems. Its main defition of a system relates to the knowledge in general. It focus on the assumption that writing provides an aspect of historicality.