{ "schemaVersion": 2, "release": "2026.09", "policy": "Published place coordinates are modern orientation/reference aids unless a feature explicitly carries verified historical-geometry evidence. They do not imply timeless historical borders. Qualified historical boundary layers are permitted only when source-controlled evidence and uncertainty metadata pass the release gate.", "requiredEvidenceFields": [ "sourceCitation", "sourceUrl" ], "requiredBoundaryEvidenceFields": [ "sourceCitation", "sourceUrl", "geometryScope", "periodLabel", "precision", "method" ], "boundaryQualificationRule": "Non-point historical geometry must explicitly carry notExactFrontier=true. 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