About: http://webisa.webdatacommons.org/280570327

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	Well, while its an old system, its probably powerful enough for experimentation - might even be able to run a GUI on it, though text only is a better idea.
http://www.w3.org/ns/prov#wasQuotedFrom	superuser.com