About: http://webisa.webdatacommons.org/400737543

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Some databases, such as MSSQL and DB2, treat a NULL value as a distinct value, only allowing one per column.
http://www.w3.org/ns/prov#wasQuotedFrom	flourishlib.com