Virtuoso 37000 Error SP030: SPARQL compiler, line 0: Bad character '&' (0x26) in SPARQL expression at '&' SPARQL query: define sql:big-data-const 0 define sql:describe-mode "CBD" DESCRIBE <http://dati.lavoro.gov.it/lod/7260ac85-c926-a87f-e054-020820f2d1c3-row-35765f5e4cb835ba1f07f61c268bcf3b>