About: http://webisa.webdatacommons.org/71147742

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	.Length == 0 is the fastest option, but .Empty makes for slightly cleaner code.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com