About: http://webisa.webdatacommons.org/102260735

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 your case, it is not threadsafe, i.e. possibly not, in fact, a singleton.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com