About: http://webisa.webdatacommons.org/79542883

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	singleton is a class with a private constructor and you could only get one instance of it. for further explanation why this coding style is done I suggest you read the chapter regarding singletons in this book
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com