About: http://webisa.webdatacommons.org/82847188

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	Slavery is a form of property, and yes, you can have slavery as the result of voluntary transactions.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com