This diagram shows a "flattened" representation of an entry, where attributes defined in ExtensionModules are first-class attributes of the entry itself -- instead of being "referenced by" or "linked to" an entry, they are actual attributes of Entry.
Here's a one page comparison of data models.
now rewritten, is it clearer?
Yes, thanks. You're pointing out that the entry has a number of attributes that it "owns" and a number of other attributes that hold relations to other entities.
content multiple parts of the content?
Related other entries citing or cited by the entry
See discussion at SiteAndSyndication about an entry's relations to containers