I think it well worth copying Jeff's initial response. I would be interested in responses to it.
"It’s pretty easy to write an XSL stylesheet to convert “records” into RDF/XML, and then write a little M/R job to run the XSL against a big bulk of records to boil it down. The intellectual challenge is the semantic mapping of idiomatic data into RDF vocabulary terms. Jeff" Dominic Sent from Yahoo! Mail on Android
