About: http://webisa.webdatacommons.org/358551407

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	Basically, unless the universe you occupy is empty except for people zipping about at relativistic velocities in all directions, then it is easy to set a standard reference. :)
http://www.w3.org/ns/prov#wasQuotedFrom	civfanatics.com