"The challenge, experts say, is in finding a way to represent all data so that when it is connected to the web, links to other relevant information can be recog

"The challenge, experts say, is in finding a way to represent all data so that when it is connected to the web, links to other relevant information can be recognised and established." That's not the challenge, RDF has made that possible for ages. (You don't even need RDF for that, globally unique identifiers are the important thing. RDF just makes it easier.) The challenge is getting people with interesting data to publish it in a machine-readable format.