About: http://webisa.webdatacommons.org/326369054

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	Applying that understanding to your example, I see that B and A are objects, and f is a morphism between them.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com