About: http://webisa.webdatacommons.org/455080213

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	I think the flag would be better as a protected piece of post meta for each relevant post rather than a site option, e.g. with the key _wp_system_page or such.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.org