{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "livingThings": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/speciesType"
      }
    }
  },
  "required": [
    "livingThings"
  ],
  "definitions": {
    "speciesType": {
      "type": "object",
      "properties": {
        "species": {
          "type": "string"
        },
        "population": {
          "type": "number"
        }
      },
      "required": [
        "species"
      ]
    }
  }
}