About: http://webisa.webdatacommons.org/100534213

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	I have chosen to accept Minhyong's answer, as he is the one that comes closest to giving examples of the sort I had in mind and also convincingly addresses the more general question at the end.
http://www.w3.org/ns/prov#wasQuotedFrom	mathoverflow.net