what is the organization of the publishing industry?
I don't know if such a question can be definitively answered, but here are plenty of websites with some information on various facets of the industry. You should be able to draw conclusions and come up with your own "organization tree" or some other way to describe or illustrate such an organization pattern:
http://www.google.com/search?q=publishing+industry&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA
http://www.google.com/search?q=publishing+industry+organization&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA
And this article is VERY interesting because it indicates one of the newest trends in publishing these days:
http://www.nytimes.com/2006/06/05/books/05digi.html?ex=1307160000&en=a5abdb7fe3a0f48b&ei=5088
=)