@prefix xd4: <http://data.loterre.fr/ark:/67375/XD4> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix isothes: <http://purl.org/iso25964/skos-thes#> .
@prefix uneskos: <http://purl.org/umu/uneskos#> .

xd4: a skos:ConceptScheme .
xd4:-PPPC
  skos:prefLabel "Processus physique / Processus chimique"@fr, "Physical phenomenon / Chemical phenomenon"@en ;
  a isothes:ConceptGroup ;
  skos:member xd4:-FH94RDXW-T .

xd4:-FH94RDXW-T
  uneskos:memberOf xd4:-PPPC ;
  skos:hiddenLabel "Biréfraction"@fr, "Birefraction"@en ;
  a skos:Concept ;
  skos:inScheme xd4: ;
  skos:prefLabel "biréfraction"@fr, "birefraction"@en, "doble refracción"@es .