<http://caligraph.org/ontology/Hecla-class_survey_vessel>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Survey_vessel_of_the_Royal_Navy> .
<http://caligraph.org/ontology/Bulldog-class_survey_vessel>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Survey_vessel_of_the_Royal_Navy> .
<http://caligraph.org/ontology/Echo-class_survey_vessel_(2002)>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Survey_vessel_of_the_Royal_Navy> .
<http://caligraph.org/ontology/Survey_vessel_of_the_Royal_Navy>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Survey_vessels_of_the_Royal_Navy> .
<http://caligraph.org/ontology/Survey_vessel_of_the_Royal_Navy>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/Survey_vessel_of_the_Royal_Navy>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Ship> .
<http://caligraph.org/ontology/Survey_vessel_of_the_Royal_Navy>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/List_of_survey_vessels_of_the_Royal_Navy> .
<http://caligraph.org/ontology/Echo-class_survey_vessel_(1957)>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Survey_vessel_of_the_Royal_Navy> .
<http://caligraph.org/ontology/Survey_vessel_of_the_Royal_Navy>	<http://www.w3.org/2000/01/rdf-schema#label>	"Survey vessel of the Royal Navy" .