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+xml define sql:describe-mode "CBD" DESCRIBE <http://dati.lavoro.gov.it/lod/4c5cac85-2eeb-b568-e054-020820f2d1c3-row-73f2b73b5d290b1dd6e314e103d3a4c6>