Sam Ruby: Sifting for Metadata: "Sifting for Metadata
Elias Torres: Atom undoubtedly will be the format and API of choice for all these content types, but its design was to be the minimal amount of metadata to communicate information and not a rich semantic framework to express it all.
Along the way, Elias notes the irony in that the output of a SPARQL query is not RDF/XML.
I agree that Atom isn’t intended to be a rich semantic framework, much in same way that HTTP was never intended to be a highly advanced distributed object system. I’ll also note in passing that RDF is multi-faceted."
Also - directly from the Elias Torrez article:
"Tags are just the tip of the iceberg, we need to start exploring richer metadata models and RDF is a good start."