About: http://webisa.webdatacommons.org/453101316

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	Think about it, if T is an int, and the value IS actually 0 and SHOULD be zero, it will throw an exception, whereas if you check for null, it would not throw an exception.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com