For X-Ray, when a new book is purchased/downloaded then this additional information is also downloaded but in a separate/side-by-side file.. That means no connectivity required. Conversely it may also mean that the data is fixed and if they missed something then you have to go searching manually.
What I am really interested is in, perhaps custom methods can be used to create these files of side-by-side content with books(calibre plugin anyone?), unless amazon restricts is to DRMed ebook purchases.
I can imagine how awesome this would be when reading a popular title (only popular title will have information that goes beyond 'facts'). All the extra info would make it worth re-reading the favorites/classics. There can be various features like writer/critics commentary, and all sorts of story/book/meta related information.
eg, Teachers could create this side-by-side data to aid students by linking various topics and what not.
Very exciting.
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