Virtuoso 37000 Error SP030: SPARQL compiler, line 0: Bad character '&' (0x26) in SPARQL expression at '&' SPARQL query: define sql:big-data-const 0 #output-format:application/rdf+json define sql:describe-mode "CBD" DESCRIBE <http://dati.lavoro.gov.it/lod/ac97ac85-fed1-0833-e054-020820d23886-row-0f1af04877cf926d2798df04963b2cb6>