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

<http://www.irandoc.acir/onto/irandoc/NEMA000435>
  skos:prefLabel "حمل‌ونقل لوله‌ای"@fa, "pipeline transport"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0001919> .

<http://www.irandoc.acir/onto/irandoc/NEMA0001919>
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA000435> ;
  skos:broader <http://www.irandoc.acir/onto/irandoc/NEMA0001921> ;
  skos:prefLabel "خطوط لوله گاز"@fa, "gas pipelines"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

<http://www.irandoc.acir/onto/irandoc/NEMA0001921>
  skos:prefLabel "خطوط لوله"@fa, "pipelines"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/NEMA0001919> .