About: http://webisa.webdatacommons.org/224358337

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	Which will return you B's ID and a flag that indicates whether this ID is OK or not.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com