About: http://webisa.webdatacommons.org/268750315

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	An object can specify and post a notification, and any other object can register itself as an observer of that notification.
http://www.w3.org/ns/prov#wasQuotedFrom	oreilly.com