Quote:
Originally Posted by jswinden
X-Ray has to be added by the author/publisher. It cannot just magically appear in books. As such the problem is that most authors/publishers don't take the extra time to add this feature to their books. For those who read a lot of non-fiction like I do, X-Ray is just a mythical feature we hear about but never see. 
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True!
The only non technical or IT related book that I read recently was Steve Jobs bio. There, X-RAY was useful indeed.
But for my regular MS-SQL or database books, I do not see the point of X-RAY. It's not available on most of those books and it won't provide any added benefit.