package main

import (
    "fmt"
    "os"
    "xml"
)

type Email struct {
    Where string `xml:"attr"`
    Addr  string
}

type Result struct {
    XMLName xml.Name `xml:"result"`
    Name    string
    Phone   string
    Email   []Email
    Groups  []string `xml:"group>value"`
}

const filename = "test2.xml"

func main() {
    oldResult := Result{xml.Name{"", "result"},
        "Grace R. Emlin", // name
        "phone",      // no phone given
        []Email{
            Email{"home", "gre@example.com"},
            Email{"work", "gre@work.com"},
        },
        []string{"Friends", "Squash"},
    }

    out, err := os.Create(filename)
    if err != nil { fmt.Println(err); os.Exit(1) }
    err = xml.Marshal(out, oldResult)
    if err != nil { fmt.Println(err); os.Exit(1) }
    fmt.Fprintf(out, "\n")
    out.Close()

    in, err := os.Open(filename)
    if err != nil { fmt.Println(err); os.Exit(1) }
    var newResult Result
    err = xml.Unmarshal(in, &newResult)
    if err != nil { fmt.Println(err); os.Exit(1) }
    in.Close()
    fmt.Printf("oldResult: %v\n", oldResult)
    fmt.Printf("newResult: %v\n", newResult)
    fmt.Printf("oldResult: %#v\n", oldResult)
    fmt.Printf("newResult: %#v\n", newResult)
}