@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<http://www.irandoc.acir/onto/irandoc/NEMA0008719>
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0002606> ;
  skos:broader <http://www.irandoc.acir/onto/irandoc/NEMA0008720> ;
  skos:prefLabel "هلیم (شیمی)"@fa, "helium"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

<http://www.irandoc.acir/onto/irandoc/NEMA0002606>
  skos:prefLabel "گاز طبیعی"@fa, "natural gas"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0008719> .

<http://www.irandoc.acir/onto/irandoc/NEMA0008720>
  skos:prefLabel "گازهای کمیاب"@fa, "rare gases"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/NEMA0008719> .