About: http://webisa.webdatacommons.org/29843238

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	WMF/EMF are converted internally to PNG. This is to allow them to be rendered with special effects, rotation, mirroring and other effects that are not possible if the image is in metafile format.
http://www.w3.org/ns/prov#wasQuotedFrom	vbforums.com