Has anyone used Mathematica to query SPARQL endpoints? It seems like it would be possible to query a SPARQL service and create Graph instances based on the results returned from SPARQL Construct queries.
SPARQL isn't something that you'll see used as often with the Wolfram Language. You can usually do what you want with pattern matching instead of SPARQL for local graphs.
AKAIK there aren't any packages or any special functionality you can leverage.