@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix isothes: <http://purl.org/iso25964/skos-thes#> .

<https://concepts.sagepub.com/social-science/concept/petroleum_technology>
  skos:narrower <https://concepts.sagepub.com/social-science/concept/petroleum_refining>, <https://concepts.sagepub.com/social-science/concept/petroleum_extraction> ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/fuel_technology> ;
  skos:prefLabel "petroleum technology"@en ;
  a skos:Concept .

<https://concepts.sagepub.com/social-science/concept/petroleum_refining>
  skos:prefLabel "petroleum refining"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/petroleum_technology> .

<https://concepts.sagepub.com/social-science/concept/fuel_technology>
  skos:prefLabel "fuel technology"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/petroleum_technology> .

<https://concepts.sagepub.com/social-science/concept/conceptgroup/concepts>
  a skos:Collection, isothes:ConceptGroup ;
  skos:prefLabel "concepts"@en ;
  skos:member <https://concepts.sagepub.com/social-science/concept/petroleum_technology> .

<https://concepts.sagepub.com/social-science/concept/petroleum_extraction>
  skos:prefLabel "petroleum extraction"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/petroleum_technology> .