About: http://webisa.webdatacommons.org/34170514

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	But since you are looking to modernize your software (which is a Good Thing), and you are an experienced Java developer, here is what I would do:
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com