About: http://webisa.webdatacommons.org/298249643

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	Yes, it is using the mediator pattern, but most of the interactions that are done through the mediator are done by publishing/subscribing to events on the mediator, which is essentially the observer pattern.
http://www.w3.org/ns/prov#wasQuotedFrom	joezimjs.com