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

<http://www.irandoc.acir/onto/irandoc/AEM0001379>
  skos:prefLabel "Petroleum"@en, "نفت"@fa ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/AEM0001372> .

<http://www.irandoc.acir/onto/irandoc/AEM0001372>
  skos:related <http://www.irandoc.acir/onto/irandoc/AEM0001581> ;
  skos:broader <http://www.irandoc.acir/onto/irandoc/AEM0001379> ;
  skos:prefLabel "Oil rig"@en, "دکل حفاری نفت"@fa ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

<http://www.irandoc.acir/onto/irandoc/AEM0001581>
  skos:prefLabel "Offshore drilling rig"@en, "دکل حفاری دریایی"@fa ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/AEM0001372> .