{
  "id": "http://yourdomain.com/schemas/myschema.json",
  "type": "object",
  "properties": {
    "name": {
      "oneOf": [
        {
          "type": "object",
          "properties": {
            "first_name": {
              "type": "string"
            },
            "created": {
              "type": "string",
              "format": "date-time"
            }
          }
        },
        {
          "type": "object",
          "properties": {
            "last_name": {
              "type": "string"
            },
            "created": {
              "type": "string",
              "format": "date-time"
            }
          }
        }
      ]
    }
  },
  "additionalProperties": false
}