About: http://webisa.webdatacommons.org/140451147

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	Invisible barriers are there mostly to point out the world ends here and considering the amount of space you can explore, variety of means to do it and amount of stuff you can discover, personally I haven???t found a problem with it.
http://www.w3.org/ns/prov#wasQuotedFrom	rpgwatch.com