About: http://webisa.webdatacommons.org/45061342

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	Combine that with a built-in way to restrict the search to specific conferences, sort the output by conference, user, or date, and group by conference or user, and you could determine all kinds of things.
http://www.w3.org/ns/prov#wasQuotedFrom	eingang.org