<http://caligraph.org/ontology/Song_about_Nelson_Mandela>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Song_about_presidents> .
<http://caligraph.org/ontology/Song_about_presidents>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Songs_about_presidents> .
<http://caligraph.org/ontology/Song_about_presidents>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Work_about_presidents> .
<http://caligraph.org/ontology/Song_about_presidents>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/Song_about_Sheikh_Mujibur_Rahman>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Song_about_presidents> .
<http://caligraph.org/ontology/Song_about_presidents_of_the_United_States>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Song_about_presidents> .
<http://caligraph.org/ontology/Song_about_presidents_of_North_Korea>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Song_about_presidents> .
<http://caligraph.org/ontology/Song_about_presidents>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Song_about_politicians> .
<http://caligraph.org/ontology/Song_about_presidents>	<http://www.w3.org/2000/01/rdf-schema#label>	"Song about presidents" .