Оптимизация скрипта парсера xml на Golang

<?xml version="1.0" encoding="UTF-8" ?> 
<countries>
 <country>
  <code>CH</code>
  <name>Schweiz</name>
  <regions>
   <region>
    <code>10</code>
    <name>Mittelland</name>
    <subregions>
     <subregion>
      <code>11</code>
      <name>Blah blah</name>

package main

import (
	"encoding/xml"
	"fmt"
	"io/ioutil"
)

type Destination struct {
	CountryCode   string   `xml:"code"`
	CountryName   string   `xml:"name"`
	RegionCode    []int    `xml:"regions>region>code"`
	RegionName    []string `xml:"regions>region>name"`
	SubregionCode []int    `xml:"regions>region>subregions>subregion>code"`
	SubregionName []string `xml:"regions>region>subregions>subregion>name"`
}

type Destinations struct {
	Destinations []Destination `xml:"country"`
}

func main() {

	d := Destinations{}

	data, _ := ioutil.ReadFile("xml/countryregion.xml")

	err := xml.Unmarshal(data, &d)
	if err != nil {
		fmt.Printf("error: ", err)
		return
	}

	for i, e := range d.Destinations {
		fmt.Printf("Country: %s - %s\n", e.CountryCode, e.CountryName)

		for ri, r := range d.Destinations[i].RegionCode {
			fmt.Printf("Region: %d - %s\n", r, d.Destinations[i].RegionName[ri])

		}
		if len(d.Destinations[i].SubregionCode) != 0 {
			for sri, sr := range d.Destinations[i].SubregionCode {
				fmt.Printf("SubRegion: %d - %s, Parent region?  \n", sr, d.Destinations[i].SubregionName[sri])

			}

		}

	}

}