<http://caligraph.org/ontology/1950_in_Vietnam>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:1950s_in_Vietnam> .
<http://caligraph.org/ontology/1950_in_Vietnam>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/1950> .
<http://caligraph.org/ontology/1950_in_Vietnam>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/1950_in_Vietnam>	<http://www.w3.org/2000/01/rdf-schema#label>	"1950 in Vietnam" .
<http://caligraph.org/ontology/1950_in_North_Vietnam>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/1950_in_Vietnam> .
<http://caligraph.org/ontology/1950_in_South_Vietnam>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/1950_in_Vietnam> .