About: http://webisa.webdatacommons.org/158518994

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 you do not want to specify anything other than the URLs, and you can not get nice names from the server, you can guess the file type and attempt to get at least meaningful extensions.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com