About: http://webisa.webdatacommons.org/345683082

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	My guess is, the code you are looking at is part of a section of code that will figure out what search string brought the user to this page, if the referrer is a major search engine (ie, google, yahoo, msn, aol).
http://www.w3.org/ns/prov#wasQuotedFrom	slashdot.org