About: http://webisa.webdatacommons.org/215530663

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	Just like with const in C, it is a hassleand hardly ever avoids a problem.Using NIL pointers is a problem though, e.g, trying to iterate over aNIL collection.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com