Drupal in specific, and the web in general, are developing to be more and more semantic.
By “semantic” we mean that the content describes itself. Drupal 7 will probably contain many RDF capabilities, that will allow us to inject descriptive data into our website, thus making it more understandable to search engines, or other websites (and eventually yes... also to humans...).
OAI-ORE (Open Archives Initiative Object Reuse and Exchange) is one special case, in which media assets on a website, are described and aggregated in an XML file (RDF, RDFa or ATOM).
