About: http://webisa.webdatacommons.org/232322873

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	To ensure only one add/remove action is taken, a solution is to use the SEQNUM environment variable, whose value is a always increasing integer, and keep track of its value when the device first got inserted.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com