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

<http://www.irandoc.acir/onto/irandoc/NEMA0001867>
  skos:prefLabel "دوران اول زمین‌شناسی"@fa, "primary era"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0001866> .

<http://www.irandoc.acir/onto/irandoc/NEMA0001866>
  skos:related <http://www.irandoc.acir/onto/irandoc/NEMA0001867> ;
  skos:broader <http://www.irandoc.acir/onto/irandoc/NEMA0001790>, <http://www.irandoc.acir/onto/irandoc/NEMA0001871> ;
  skos:prefLabel "پرکامبرین"@fa, "precambrian"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

<http://www.irandoc.acir/onto/irandoc/NEMA0001790>
  skos:prefLabel "تاریخ (زمان)"@fa, "date"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/NEMA0001866> .

<http://www.irandoc.acir/onto/irandoc/NEMA0001871>
  skos:prefLabel "زمین‌شناسی تاریخی"@fa, "historical geology"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/NEMA0001866> .