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

<http://www.irandoc.acir/onto/irandoc/chmtr000387>
  skos:narrower <http://www.irandoc.acir/onto/irandoc/chmtr000385> ;
  skos:related <http://www.irandoc.acir/onto/irandoc/chmtr000129> ;
  skos:prefLabel "گاز‌های طبیعی"@fa, "natural gases"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

<http://www.irandoc.acir/onto/irandoc/chmtr000385>
  skos:prefLabel "سی.ان.جی"@fa, "c.n.g"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:broader <http://www.irandoc.acir/onto/irandoc/chmtr000387> .

<http://www.irandoc.acir/onto/irandoc/chmtr000129>
  skos:prefLabel "فراورده‌های پتروشیمیایی"@fa, "petrochemical products"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/chmtr000387> .