About: http://webisa.webdatacommons.org/441395634

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	If background is a string it will be interpreted as a filename pointing to a PNG file which will be loaded as background.[procedure] (show!)
http://www.w3.org/ns/prov#wasQuotedFrom	call-cc.org