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/ff98ac85-826a-3334-e054-020820d23886-row-f6850e59ac8bffb6b25ec6ff344f7b73>