<http://webisa.webdatacommons.org/prov/287187866>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/428610881> .
<http://webisa.webdatacommons.org/428610881>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/428610881>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<sspnet.org> .
<http://webisa.webdatacommons.org/428610881>	<http://www.w3.org/ns/prov#value>	"Commodities such as flight tickets and hotel rooms, sold within a yield management programme, vary even more." .