About: http://webisa.webdatacommons.org/91589563

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	If our expression is unary ???-??? operation and the argument is a second unary ???-??? operation with any expression e as an argument (think: -(-e)), then simply return e.
http://www.w3.org/ns/prov#wasQuotedFrom	javacodegeeks.com