{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "system.schema.json",
  "title": "Star System Metadata",
  "description": "System definition file — one per system directory (D-036).",
  "type": "object",
  "required": ["display_name"],
  "additionalProperties": false,
  "properties": {
    "display_name": {
      "type": "string",
      "minLength": 1
    },
    "description": {
      "type": "string"
    },
    "stations": {
      "type": "array",
      "items": {
        "type": "string",
        "pattern": "^[a-z][a-z0-9-]*$"
      },
      "uniqueItems": true
    }
  }
}