About: http://webisa.webdatacommons.org/162335407

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	Headers only means it only fetches the email headers, such as from, to, subject, date etc.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com