Schema.org helps ranking?
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I would say that it has an indirect impact on ranking, so-to-speak.
This is because, following a structured schema, like Schema.org, will help ensure you have legible code within your site for the crawlers. Know what I mean?
Just because you have it on your site, however, does not mean you will automatically go up in rankings.
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So it doesn't appear to have any direct impact on Google's algorithm, right?
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Well, yes and no. Like I said, it's indirect.
It can have an effect on the algorithm in that using certain elements from Schema.org (and others like it) to create, for example, proper breadcrumbs on your site, which will in turn be picked up by Google and display those breadcrumbs within the SERP's.
For example (and a little shameless plug), here is my site in the #1 position in the SERP's with Schema.org created breadcrumbs: https://www.google.com/search?q=2728+23rdwyandotte#hl=en&sa=X&ei=J_3YTrr8Neb20gGQ0JnSDQ&ved=0CBcQBSgA&q=2728+23rd+wyandotte&spell=1&bav=on.2,or.r_gc.r_pw.r_cp.,cf.osb&fp=1ee69a25240f81e5&biw=1920&bih=979
Others you can see will have an image of a video show up, or even an author and such. Schema.org is more of a way of creating a unified method for crawlers to crawl and properly index ones website based on the usage of the Schema.org schematics. THey can help draw attention to your listing within the SERP's, but to my knowledge, do not influence your position within the SERP's.
Hope that helps.