An elusive and little understood feature. I could find no answers on how to implement Kindle XRAY from an Authors perspective. And this is probably why…
Amazon Kindle X-ray Feature: Using Shelfari, Goodreads, Wikipedia, Youtube
An out-of-the-box ebook marketing idea: Did you know that Amazon’s Kindle X-ray Feature allows the ebook reader to easily find content, chapters and locations mentioning concepts, places or ideas, as well as characters and places in your ebook. It even allows readers to explore author biographies and obtain additional background information as well as provide related content from Shelfari, Wikipedia and Youtube?