Over the past few days, I’ve thrown together a simple Java GUI application to query SPARQL endpoints that purport to have file format information. The results have been less than sparkling. The only endpoint that I’ve been able to query successfully is the one for DBPedia (http://dbpedia.org/sparql), and the data there, extracted from infoboxes on Wikipedia pages, is too inconsistent for structured queries to be of much use.
The endpoints for Pronom (http://test.linkeddatapronom.nationalarchives.gov.uk/sparql/endpoint.php) and P2 (http://p2-registry.ecs.soton.ac.uk/SPARQL/) just aren’t responding, and I can’t find a published endpoint for UDFR. If anyone can help me out with these, maybe I can make some more progress.
What I have to show for my effort so far is a beginner’s knowledge of SPARQL and an application that can easily be tailored to query any SPARQL HTTP endpoint. If anyone’s interested in seeing it, let me know.