{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "district.schema.json",
  "title": "District Metadata",
  "description": "District definition file — one per district directory (D-036).",
  "type": "object",
  "required": ["canonical_id", "display_name", "system", "station", "district", "description", "locations", "npc_count"],
  "additionalProperties": false,
  "properties": {
    "canonical_id": {
      "type": "string",
      "pattern": "^[a-z]+\\.[a-z]+\\.[a-z-]+$",
      "description": "Canonical ID in format {system}.{station}.{district}"
    },
    "display_name": {
      "type": "string",
      "minLength": 1
    },
    "system": {
      "type": "string",
      "pattern": "^[a-z]+$"
    },
    "station": {
      "type": "string",
      "pattern": "^[a-z]+$"
    },
    "district": {
      "type": "string",
      "pattern": "^[a-z-]+$"
    },
    "description": {
      "type": "string",
      "minLength": 1
    },
    "locations": {
      "type": "array",
      "items": {
        "type": "string",
        "pattern": "^[a-z][a-z0-9-]*$"
      },
      "minItems": 1,
      "uniqueItems": true
    },
    "npc_count": {
      "type": "integer",
      "minimum": 0
    }
  }
}