About: http://webisa.webdatacommons.org/24319821

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	But what if the get returned null because at the call time that key was not present, but between the get call and the test on it is return value that key was added to the map (from another thread, somewhere else in the code)?
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com