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/648deeb9-b602-e15a-e054-020820d23886-row-6ec9dce2221a678b013d8443c406b5f6>