[css3-regions] page view and page layout use cases

I have collected a set of use cases for page view, trying to show both how pages are generated and how they are presented to the user.

http://wiki.csswg.org/spec/page-view

I hope that it will be useful in discussion on different approaches to paged presentation, definitions of pages, related media selectors etc.

Feedback, corrections, suggestions will be appreciated

Thanks
Alex