<http://caligraph.org/ontology/Billboard_Mainstream_Top_40_number-one_song_of_2009>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/Billboard_Mainstream_Top_40_number-one_song_of_2009>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Number-one_song_in_the_United_States> .
<http://caligraph.org/ontology/Billboard_Mainstream_Top_40_number-one_song_of_2009>	<http://www.w3.org/2000/01/rdf-schema#label>	"Billboard Mainstream Top 40 number-one song of 2009" .
<http://caligraph.org/ontology/Billboard_Mainstream_Top_40_number-one_song_of_2009>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/List_of_Billboard_Mainstream_Top_40_number-one_songs_of_2009> .