About: http://webisa.webdatacommons.org/237111047

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	Usually, a singleton is a class of which the author expects that there will only ever be one instance.
http://www.w3.org/ns/prov#wasQuotedFrom	object-oriented-security.org