About: http://webisa.webdatacommons.org/150550807

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	If you want to implement this check, write a custom code workflow which first checks if there is an existing item and then either overwrites / updates it or skips copying all together.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com