About: http://webisa.webdatacommons.org/243083991

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	Indeed, I was sort of hoping someone else might come along and give a characterisation which didn't need contractive projection...
http://www.w3.org/ns/prov#wasQuotedFrom	mathoverflow.net