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

<http://www.irandoc.acir/onto/irandoc/CHMTR000067>
  skos:prefLabel "پتروشیمی"@fa, "petrochemistry"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/CHMTR000400> .

<http://www.irandoc.acir/onto/irandoc/CHMTR000388>
  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/CHMTR000400> .

<http://www.irandoc.acir/onto/irandoc/CHMTR000400>
  skos:related <http://www.irandoc.acir/onto/irandoc/CHMTR000067>, <http://www.irandoc.acir/onto/irandoc/CHMTR000388> ;
  skos:prefLabel "Iran first petrochemical unit"@en, "نخستین واحد پتروشیمی ایران"@fa ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .