About: http://webisa.webdatacommons.org/91424181

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	In C++, a std::string is a value, but it contains a reference (pointer, actually) to a mutable buffer.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com