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Good answer. If i were a search engine, and some one searched for a blue widget, i could return a page that mentions a blue widget and has an image, that maybe of a blue widget. Or i could return your page that has a image marked up with HTML5, and microdata telling me that the image is in fact of a blue widget along with all the other details you can mark up with microdata and html5 telling me that the page has a lot of information about blue widgets, i know whitch one i would return to the user.