package main

import (

    "encoding/xml"

    "fmt"

    "os"

    "time"

)

type xmldas struct {

    XMLName           xml.Name       `xml:"page"`

    Xmlns             string         `xml:"xmlns,attr"`

    XmlnsXsi          string         `xml:"xmlns:xsi,attr"`

    XsiSchemaLocation string      `xml:"xsi:schemaLocation,attr"`

    XmlnsEditor       string        `xml:"xmlns:editor,attr"`

    Width             string         `xml:"width,attr"`

    Height            string        `xml:"height,attr"`

    Auth              xmlAuth        `xml:"auth"`

}

type xmlAuth struct {

    Name string `xml:name`

    Age  int `xml:age`

}

func main() {

    v := xmldas{Xmlns:"http://cloudprint.cainiao.com/print", XmlnsXsi:"http://www.w3.org/2001/XMLSchema-instance", XsiSchemaLocation:"http://cloudprint.cainiao.com/print http://cloudprint-docs-resource.oss-cn-shanghai.aliyuncs.com/lpml_schema.xsd", XmlnsEditor:"http://cloudprint.cainiao.com/schema/editor", Width:"", Height:"" }

    v.Auth = xmlAuth{Name:"ha666", Age:}

    output, err := xml.MarshalIndent(v, "", "\t")

    if err != nil {

        fmt.Printf("error: %v\n", err)

    }

    filename := time.Now().Format("2006-01-02-15-04-05")

    userFile := filename + ".xml"

    fout, err := os.Create(userFile)

    defer fout.Close()

    if err != nil {

        fmt.Println(userFile, err)

        return

    }

    fout.Write([]byte(xml.Header))

    fout.Write(output)

    fout.Close()

}

<?xml version="1.0" encoding="UTF-8"?>

<page xmlns="http://cloudprint.cainiao.com/print" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://cloudprint.cainiao.com/print http://cloudprint-docs-resource.oss-cn-shanghai.aliyuncs.com/lpml_schema.xsd" xmlns:editor="http://cloudprint.cainiao.com/schema/editor" width="" height="">

    <auth>

        <Name>ha666</Name>

        <Age></Age>

    </auth>

</page>