{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "oneOf": [
    {
      "type": "object",
      "properties": {
        "dog": {
          "type": "string"
        }
      },
      "additionalProperties": false,
      "required": [ "dog" ]
    },
    {
      "type": "object",
      "properties": {
        "cat": {
          "type": "string"
        }
      },
      "additionalProperties": false,
      "required": [ "cat" ]
    }
  ]
}