About: http://webisa.webdatacommons.org/232370720

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	More seriously, everything you write is perfectly correct, including the reduction to the case where both schemes are affine.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com