What is ROR sitemap?

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. This helps the search engine to decide which elements of the site need to crawl and which will be excluded. This is complement to 'robot.txt' and URL exclusion. The sitemap helpful for those sites which have Flash and Ajax content which are not possible to be found out by the search engine bot software.