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

<http://www.irandoc.acir/onto/irandoc/HLT000535>
  skos:prefLabel "Ventilation"@en, "تهویه"@fa ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/HLT000977> .

<http://www.irandoc.acir/onto/irandoc/HLT000401>
  skos:prefLabel "Air pollution"@en, "آلودگی هوا"@fa ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/HLT000977> .

<http://www.irandoc.acir/onto/irandoc/HLT000977>
  skos:related <http://www.irandoc.acir/onto/irandoc/HLT000535>, <http://www.irandoc.acir/onto/irandoc/HLT000401> ;
  skos:broader <http://www.irandoc.acir/onto/irandoc/HLT000983> ;
  skos:prefLabel "Air"@en, "هوا"@fa ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

<http://www.irandoc.acir/onto/irandoc/HLT000983>
  skos:prefLabel "Environment"@en, "محیط ‌زیست"@fa ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/HLT000977> .