About: http://webisa.webdatacommons.org/40250598

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 you would have to create a script that only allows those three image types and will prompt the user to to convert the image if the try and upload a bmp.
http://www.w3.org/ns/prov#wasQuotedFrom	codingforums.com