<http://caligraph.org/ontology/Energy_exchange>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Energy_exchanges> .
<http://caligraph.org/ontology/Energy_exchange>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/Energy_exchange>	<http://www.w3.org/2000/01/rdf-schema#label>	"Energy exchange" .
<http://caligraph.org/ontology/Energy_exchange>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Futures_exchange> .
<http://caligraph.org/ontology/Electric_power_exchange>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Energy_exchange> .
<http://caligraph.org/ontology/Energy_exchange>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Commodity_exchange> .
<http://caligraph.org/ontology/Energy_exchange_in_Europe>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Energy_exchange> .