{
  "id": "http://yourdomain.com/schemas/myschema.json",
  "description": "Example description",
  "type": "object",
  "properties": {
    "names": {
      "allOf": [
        {
          "type": "object",
          "properties": {
            "first_name": {
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        {
          "type": "object",
          "properties": {
            "last_name": {
              "type": "string"
            }
          },
          "additionalProperties": false
        }
      ]
    }
  },
  "additionalProperties": false
}