@prefix dukems: . @prefix skos: . @prefix wd: . dukems:6 skos:notation "H2S" ; a skos:Concept ; skos:exactMatch wd:Q170591 ; skos:altLabel "Hydrogen sulfide" ; skos:broader dukems:1 ; skos:prefLabel "Hydrogen sulphide"@en . dukems:1 skos:notation "SOx" ; skos:prefLabel "Sulphur"@en ; a skos:Concept ; skos:narrower dukems:6 .