About: http://webisa.webdatacommons.org/29302785

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	I didn't really follow your example too closely, but it sounds like what you need is a multimap - a mapping from a single key to multiple values.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com