Uh, Xray is supposed to work with books Amazon sells.
Well, Amazon sells DRM-free books.
So, until somebody verifies that it *doesn't* work without DRM there is no reason to try to tie the two together.
As to its value, well:
Quote:
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X-Ray, a new feature that lets customers explore the “bones of the book.” With a single tap, readers can see all the passages across a book that mention ideas, fictional characters, historical figures, places or topics that interest them, as well as more detailed descriptions from Wikipedia and Shelfari, Amazon’s community- powered encyclopedia for book lovers Amazon built X-Ray using its expertise in language processing and machine learning access to significant storage and computing resources with Amazon S3 and EC2, and a deep library of book and character information. The vision is to have every important phrase in every book.
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Sounds like a dynamically-generated index with links to both the book and external sources.
That may or not be useful for recreational fiction but it sure sounds useful for non-fiction...