About: http://webisa.webdatacommons.org/211917753

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	That means what is passed to your filter is an array (not a WP Query object) and you add elements to that array:
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.org