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

<http://www.irandoc.acir/onto/irandoc/CHMTR000057>
  skos:broader <http://www.irandoc.acir/onto/irandoc/CHMTR000059> ;
  skos:prefLabel "روغن‌های سنگین"@fa, "heavy oils"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

<http://www.irandoc.acir/onto/irandoc/CHMTR000059>
  skos:prefLabel "برش مایع"@fa, "liquid cut"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/CHMTR000057> .