About: http://webisa.webdatacommons.org/118730922

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	The fastest way to lookup stuff is to set all columns NOT NULL, and rather use stuff like empty strings and -1 (or even 0, if that does not mean something else) for storing 'null' values.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com