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

<http://www.irandoc.acir/onto/irandoc/NEMA000366>
  skos:prefLabel "نورشناسی هندسی"@fa, "geometrical optics"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0004028> .

<http://www.irandoc.acir/onto/irandoc/NEMA0004027>
  skos:prefLabel "شیشه نوری"@fa, "optical glass"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0004028> .

<http://www.irandoc.acir/onto/irandoc/NEMA0004775>
  skos:prefLabel "شکست (فیزیک)"@fa, "refraction"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0004028> .

<http://www.irandoc.acir/onto/irandoc/NEMA0004028>
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0004775>, <http://www.irandoc.acir/onto/irandoc/NEMA000366>, <http://www.irandoc.acir/onto/irandoc/NEMA0004027> ;
  skos:broader <http://www.irandoc.acir/onto/irandoc/NEMA0004032> ;
  skos:prefLabel "عدسی‌های نوری"@fa, "optical lenses"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

<http://www.irandoc.acir/onto/irandoc/NEMA0004032>
  skos:prefLabel "تجهیزات نوری"@fa, "optical equipment"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/NEMA0004028> .