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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	Sometimes these signatures appear on pages by themselves i.e. without preceding content.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com