@prefix dukems: . @prefix skos: . dukems:177 a skos:Concept ; skos:broader dukems:116 ; skos:prefLabel "06 Extraction of crude petroleum and natural gas"@en . dukems:116 skos:prefLabel "B - MINING AND QUARRYING"@en ; a skos:Concept ; skos:narrower dukems:177 .