CDAS 2026 - Dataset A: Geopolitical Evolution
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Pure binary formal contexts (Burmeister .cxt) on countries, extracted from Wikidata.

Temporal series -- country x intergovernmental-organization membership, one snapshot
per year, union-aligned so every file shares the same 196 countries x 111 orgs:
  geopolitics-2016.cxt ... geopolitics-2026.cxt
Memberships honour the Wikidata start (P580) / end (P582) qualifiers, so each
snapshot reflects who was a member in that year. Use them to study the evolution of
geopolitical clusters and to tell conceptually stable from volatile nations.

Static relation contexts (current snapshot):
  wikidata_countries_diplomatic_relations.cxt                  country x country
  wikidata_countries_diplomatic_relations_with_added_selfrelations.cxt
  wikidata_countries_instanceof.cxt                            country x type
  wikidata_countries_intergov_orgs.cxt                         country x intergov org
  wikidata_countries_international_orgs.cxt                     country x international org

