About: http://webisa.webdatacommons.org/163117162

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	After this step, in debug block, there is a check to countObservers and if observers!= 0, then another notifyObservers call is made with an arg of null.
http://www.w3.org/ns/prov#wasQuotedFrom	apache.org