About: http://webisa.webdatacommons.org/313067029

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 have modified your code a little to check that the post type is a page, that the current user can edit that page, verify the nonce and verify the inserting attachment functions.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com