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An example SPARQL query that can help you assemble the hierarchy of classes in an ontology.

select distinct ?type ?label ?supertype 
where { 
	{ ?type a owl:Class . } UNION { ?ind a ?type . } . 
	OPTIONAL { ?type rdfs:subClassOf ?supertype } . 
	OPTIONAL { ?type rdfs:label ?label } 
} ORDER BY ?type

Source: I found this query within the web console of Stardog as one of the sample queries they provide in a drop-down list of options.