About: http://webisa.webdatacommons.org/277397063

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	In a given communications system, a timing reference obtained from a source, such as a navigation system, external to the given system.
http://www.w3.org/ns/prov#wasQuotedFrom	atis.org