我正在從 Web 檢索一些 XML，但在提取所需數據時遇到問題。這是 XML：<metadata xmlns="http://musicbrainz.org/ns/mmd-2.0#" xmlns:ext="http://musicbrainz.org/ns/ext#-2.0" created="2013-04-13T16:54:01.107Z">    <artist-list count="2" offset="0">        <artist id="35dac7d2-0b1f-470f-9a5a-c53c8821f6d6" type="Person" ext:score="100">            <name>Eric Prydz</name>            <sort-name>Prydz, Eric</sort-name>            <gender>male</gender>            <country>SE</country>        </artist>    </artist-list></metadata>我想提取姓名、性別和國家。這是代碼：package mainimport (    "encoding/xml"    "fmt"    "io/ioutil"    "net/http")func main() {    client := &http.Client{}    req, _ := http.NewRequest("GET", "http://www.musicbrainz.org/ws/2/artist/?query=artist:Fred", nil)    res, _ := client.Do(req)    bs, _ := ioutil.ReadAll(res.Body)    var artist Artist    xml.Unmarshal(bs, &artist)    fmt.Printf("%#v\n", artist)}type Artist struct {    Name    string `xml: "name"`    Gender  string `xml: "gender"`    Country string `xml: "country"`}但每次我運行這個我總是得到這個：main.Artist{Name:"", Gender:"", Country:""}有人可以指出問題出在哪里嗎？