. . . . "Answer to question: What is the current status of development for Virtuoso federation of triple stores?"@en . "Answer to question: What is the current status of development for Virtuoso federation of triple stores?" . "Virtuoso has supported Federated SPARQL a/k/a SPARQL-FED since the specification was created."@en . . . "Virtuoso has supported Federated SPARQL a/k/a SPARQL-FED since the specification was created." . . "Virtuoso has supported Federated SPARQL a/k/a SPARQL-FED since the specification was created." . . .