Subjectshttps://bdl.stat.gov.pl/api/v1/subjectsGłówny Urząd Statystyczny2026-03-05T00:00:00Hierarchically related groups of variables by the content-related scope, e.g. 'Population', 'Population by age and gender groups'.subject, category, group, subgrouppl, enapplication/json, application/xml