SCHEMA.json

1	{
2	"region": {
3	"name": "string (required)",
4	"geo": {
5	"type": "Polygon\|MultiPolygon\|Point\|...",
6	"coordinates": "GeoJSON coordinates array"
7	}
8	},
9	"eras": [
10	{
11	"name": "string (required)",
12	"start": "YYYY-MM-DD\|null (start date, null for earliest)",
13	"end": "YYYY-MM-DD\|null (end date, null for present)",
14	"calendar": "string (calendar system name)",
15	"usedBy": "string (optional — whose calendar this is, e.g. 'English colonists')",
16	"description": "string (optional)",
17	"sources": [
18	"string (URL or citation)"
19	]
20	}
21	]
22	}