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

<http://www.irandoc.acir/onto/irandoc/NEMA0001690>
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0001643>, <http://www.irandoc.acir/onto/irandoc/NEMA0001691>, <http://www.irandoc.acir/onto/irandoc/NEMA0002601> ;
  skos:broader <http://www.irandoc.acir/onto/irandoc/NEMA0001707> ;
  skos:prefLabel "روغن‌های سنگین"@fa, "heavy oils"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

<http://www.irandoc.acir/onto/irandoc/NEMA0002601>
  skos:prefLabel "نفت خام"@fa, "petroleum"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0001690> .

<http://www.irandoc.acir/onto/irandoc/NEMA0001707>
  skos:prefLabel "روغن‌ها"@fa, "oils"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/NEMA0001690> .

<http://www.irandoc.acir/onto/irandoc/NEMA0001643>
  skos:prefLabel "روان‌کننده‌ها"@fa, "lubricants"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0001690> .

<http://www.irandoc.acir/onto/irandoc/NEMA0001691>
  skos:prefLabel "روغن‌های سوختی"@fa, "fuel oils"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0001690> .