About: http://webisa.webdatacommons.org/196560444

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 certain cases (where performance is an issue) instead of counting all the matching documents you can simply tell MongoDB to get the first and check whether there is one:
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com