About: http://webisa.webdatacommons.org/447112262

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	So maybe you can have the uploaded image run through the face detection algorithm which then says whether it contains a face or not...
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com