Go で終了タグを使用せずに XML 要素を作成するにはどうすればよいですか?

type TierRequest struct {
    XMLName   xml.Name `xml:"soapenv:Envelope"`
    NsEnv     string   `xml:"xmlns:soapenv,attr"`
    NsType    string   `xml:"xmlns:typ,attr"`
    Header    string   `xml:"soapenv:Header"`

    // TierBody is an empty container with the GetCollectorProfile struct
    Body TierBody `Collectorxml:"typ:GetCollectorProfileRequest"`
}

type TierBody struct {
    GetCollectorProfiles GetCollectorProfile `Collectorxml:"typ:GetCollectorProfileRequest"`
}

type GetCollectorProfile struct {
    Contexts CollectorContext `xml:"typ:Context"`
    Number   int              `xml:"typ:CollectorNumber"`
}

type CollectorContext struct {
    Channel  string `xml:"Channel,attr"`
    Source   string `xml:"Source,attr"`
    Language string `xml:"LanguageCode,attr"`
}

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
                  xmlns:typ="http:/www.yahoo.com/tp/ets/2008/04/01/collector/types">
  <soapenv:Header></soapenv:Header>
  <soapenv:Body>
    <GetCollectorProfiles>
      <typ:Context Channel="WEB" Source="WEB" LanguageCode="en-CA"></typ:Context>
      <typ:CollectorNumber>50000</typ:CollectorNumber>
    </GetCollectorProfiles>
  </soapenv:Body>
</soapenv:Envelope>