About: http://webisa.webdatacommons.org/104194343

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	Your article got me wondering about this, too. here is a link that talks all about it, iit is really too long to copy/paste but it does try and give an explanation.
http://www.w3.org/ns/prov#wasQuotedFrom	purseblog.com