About: http://webisa.webdatacommons.org/450409063

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	Ok-travel has just one relation: Ok-flight(f-num, date, time, price, nonstop), where nonstop is a boolean.
http://www.w3.org/ns/prov#wasQuotedFrom	researchgate.net