ROR (Resources of a Resource) is an independant XML format for describing any object (products, services, reviews, discounts, images, events, schedule, podcasts, …) in a generic fashion, so that any search engine can better understand that content. rorweb.com is the official ROR website.
ROR promotes the concept of structured feeds (which is related to the concept of structured blogging) enabling search engines to complement text search with structured information to better understand meaning. ROR information is typically stored in a ROR feed called ror.xml placed in a website’s main directory.
The specifications of ROR have been updated last in march 2005. The ROR website provides FAQ’s, sample ROR feeds, a Developer’s corner, a blog, free tools and lists of ROR providers and terms. It seems however that there are currently no new activities going on at the ROR website.