Hierarchical outline

Vilash, would this be just for display of the course content, or do you envision that the hierarchy would effect the course workflow logic?

E.g., does the user always continue moving ahead to the next available content object until he/she reaches the bottom of that part of the hierarchy tree and then move up to the next branch?

@invincible1388 since #1361754: Support books as course objects, books (a hierarchical organization of content) can now be course objects. Just enable course_book module and set a book as one of your course objects. Already you can display the entire book hierarchy, by adding the core Book navigation block to your page (either in block settings, through the Context module, through panels, or however you want to expose this block to learners).

Now, IMO that is not the ideal way to present a book as a course object. Personally I think we still need two things:

1. The book hierarchy optionally displayed as part of the default 'list' outline style. This is possible since #1517256: Course outline handler was implemented, but it is the job of course_book module to add it's book outline in as a nested list in the proper place within the list of course objects.
2. Course navigation (back/next) buttons matching that nested outline. Exactly what @ezraw described in #1 of this issue. This is also possible since work already committed to #1517850: back/next buttons block, and mentioned in #1 of that issue - but has not been implemented yet in course_book.

Committed, for books: http://drupalcode.org/project/course.git/commit/cd39fd9

Fixed, course object modules can change the outline. Look at course_book for how it's done.