You have reached an unfinished article. This has happened, because the author believes in efficiency. Publishing in the www reduces the amount of work for gathering additional information. Long explanations about "why" and "what" can be replaced by a single link.
As well, the author is convinced to provide some useful information already. Take it as what it is: A beta version, but one that has been developed with care. Feel free to contact the author about all bugs.
Another page contains some notes about document usage.