About: http://webisa.webdatacommons.org/182321522

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	Note: Special emphasis made of the Java context for this discussion to delimit it from other languages' use of NULL. Remember, C, C++, Pascal, and other languages use NULL to good advantage.
http://www.w3.org/ns/prov#wasQuotedFrom	c2.com