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+PREFIX skos:   <http://www.w3.org/2004/02/skos/core#>
+PREFIX rdfs:   <http://www.w3.org/2000/01/rdf-schema#>
+PREFIX wd:     <http://www.wikidata.org/entity/>
+PREFIX dct:    <http://purl.org/dc/terms/>
+PREFIX qb:     <http://purl.org/linked-data/cube#>
+PREFIX sdmx_a: <http://purl.org/linked-data/sdmx/2009/attribute#>
+PREFIX sdmx_d: <http://purl.org/linked-data/sdmx/2009/dimension#>
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