About: http://webisa.webdatacommons.org/87012391

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	Obviously, modifying these files is not ideal and without some kind of conditionals you will not be able to reuse playa field types for anything else, but if you must here is what I did.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com