@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix ns0: <http://rdf-vocabulary.ddialliance.org/xkos#> .

<http://www.irandoc.acir/onto/irandoc/mathpro2656>
  skos:prefLabel "مشکل"@fa, "problem"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/mathpro2668> .

<http://rdf-vocabulary.ddialliance.org/xkos#comment> rdfs:label "توضیحات"@fa, "comment"@en .
<http://www.irandoc.acir/onto/irandoc/mathpro2679>
  skos:prefLabel "تربیع دایره"@fa, "quadrature of circle"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:broader <http://www.irandoc.acir/onto/irandoc/mathpro2668> .

<http://www.irandoc.acir/onto/irandoc/mathpro2668>
  ns0:comment <http://en.wikipedia.org/wiki/compass_and_straightedge_constructions> ;
  ns0:contains <http://www.irandoc.acir/onto/irandoc/mathpro88> ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/mathpro2690>, <http://www.irandoc.acir/onto/irandoc/mathpro2679> ;
  skos:broader <http://www.irandoc.acir/onto/irandoc/mathpro2656> ;
  skos:prefLabel "مشکل ساخت و ساز"@fa, "construction problem"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

<http://www.irandoc.acir/onto/irandoc/mathpro88>
  skos:prefLabel "صفحه"@fa, "هواپیما"@fa, "plane"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

ns0:contains rdfs:label "شامل"@fa, "contains"@en .
<http://www.irandoc.acir/onto/irandoc/mathpro2690>
  skos:prefLabel "تثلیث زاویه"@fa, "angle trisection"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:broader <http://www.irandoc.acir/onto/irandoc/mathpro2668> .