ROR is a rapidly growing XML format for describing any object on a website (sitemaps, products, services, menus, images, reviews, contact info, business info, etc), so any search engines can better understand its content.
Basically, Sitemap is for your site indication of how many urls are in your website. It’s doesn’t improve any keyword ranking it is just a part of SEO activity
ROR is an independent Master XML format file you place on your site.
The Master XML format file describes the different types of content you have, so that any search engines can better understand its content.
ROR is actually a kind of XML format intended to describe any kind of web content in a generic way. It can help to understand the site.
There are many opinion for this concept….may be some create confusion…
I think as per your question it may be beneficial for keyword ranking because it helps crawler , search engine to understand your site in a proper way…