{
  "$schema": "https://json-schema.org/draft-04/schema#",
  "type": "object",
  "patternProperties": {
    "^[a-zA-Z-]+$": {
      "type": "object",
      "patternProperties": {
        "^[a-zA-Z0-9. -/:@]+$": {
          "type": "string",
          "format": "uri"
        }
      },
      "additionalProperties": false
    }
  },
  "additionalProperties": false
}