About: http://webisa.webdatacommons.org/435197644

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	So in your case, I believe there is a bug, because delete should call the destructor immediately. i.e.:
http://www.w3.org/ns/prov#wasQuotedFrom	digitalmars.com