@prefix dukems: . @prefix skos: . dukems:65 a skos:Concept ; skos:broader dukems:55 ; skos:prefLabel "5.B.2 Biological treatment of waste - anaerobic Digestion Biogas"@en . dukems:55 skos:prefLabel "5. Waste"@en ; a skos:Concept ; skos:narrower dukems:65 .