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The National Library of Finland maintains and develops the following thesauri and ontologies:

  • General Finnish Upper Ontology (YSO)
  • General Finnish General Thesaurus (YSA)
  • General Finnish Thesaurus in Swedish (Allärs)
  • Finnish Music Thesaurus (MUSA)
  • Special thesaurus for music in Swedish (CILLA)
  • KOKO Ontology [the National Library of Finland has the technical and coordination responsibility]