@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ex: <http://www.exemple.fr/> .

# extend skos:Concept with a more specialized class
ex:Organization rdfs:subClassOf skos:Concept .

# extend skos:altLabel with a more specialized property
ex:acronym rdfs:subPropertyOf skos:altLabel .

# use the declared extensions
ex:a1 a ex:Organization ;
	skos:prefLabel "Organisation des Nations Unies"@fr ;
	ex:acronym "ONU"@fr .

ex:a2 a ex:Organization ;
	skos:prefLabel "Conseil de sécurité"@fr ;
	skos:broader ex:a1 .