About: http://webisa.webdatacommons.org/113844584

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	For example, many colleges and universities in the US use Blackboard for exactly the sort of thing you describe: timed quizzes with an automatic expiration, access to individual grades, course content, etc.
http://www.w3.org/ns/prov#wasQuotedFrom	metafilter.com