About: http://webisa.webdatacommons.org/441369552

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	If you send an If-Modified-Since header with a date that is in the past (5 mins previous to the current time should do it) then sites such as google.com, w3.org, mattcutts.com will return a HTTP/1.1 304 Not Modified header.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com