I heard an interesting piece on NPR about considering Anne Frank's Diary as literature, not just as history.

"She decided that she wanted the book to be published, and she went back to the beginning and she re-wrote all the entries she wrote as a 13-year-old, except of course now she was a 15-year-old," Prose says.

http://www.npr.org/templates/story/story.php?storyId=113198365

I never considered that idea that it was a conscious decision to write a book to be published as opposed to just keeping a diary.