I’ve played with finance.yahoo.com’s feed of CSV stock ticker data before and recently had an idea that was so simple that I’m surprised that no one’s done it before: why not write a script that passes along a request for this data but converts the result to RDF before returning it? So I did.
Much of the promise of RDF and Linked Data is the ease of pulling data from multiple sources and combining it. I recently discovered the SERVICE extension that Jena adds to SPARQL, letting you send subqueries off to multiple SPARQL endpoints and then combine the results. Because a given SPARQL endpoint may be an interface to a triplestore or a relational data store or something else, the ability to query several endpoints with one query is very nice.