@prefix rdf: . @prefix skos: . @prefix rdfs: . @prefix api: . @prefix foaf: . skos:narrower . a rdfs:Resource , skos:Concept ; skos:altLabel "Relative sunspot number"@en , "SSN"@en , "Wolf number"@en ; skos:broader ; skos:prefLabel "Sunspot number"@en . a api:ItemEndpoint , api:Page ; api:definition ; api:extendedMetadataVersion ; foaf:primaryTopic .