Golang struct example

package main

import "fmt"

type ID int32

type Photo struct {
	ID      ID
	AlbumID ID `json:"album_id"`
	OwberID ID
	UserID  ID
	Text    string
	Date    int64
	// ...
}

type Audio struct {
	ID      ID
	OwnerID ID
	Artist  string
	// ...
}

type Attachment struct {
	Type  string
	Photo Photo
	Audio Audio
}

type Attachments []Attachment

func main() {
	fmt.Printf("hello, world\n")
}