[hmgauna]

I'm really interested in this topic, and unfortunately it seems to be, as you say, a lack of interest there. As far as I know, the last effort to go towards a standard in semantic markup is http://schema.org/ Apparently, the major search engines are supporting this standard by now (read http://googleblog.blogspot.com.ar/ ). According to what I read in your reply to keefe, I think this is what you may be looking for. Example for movie: http://schema.org/Movie Wish it helps, I'm not always fully satisfied with how this ends up classifying the reality, but that is where we are by now.