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How do you create XML elements without closing tags in Go?

Mary-Kate Olsen
Mary-Kate OlsenOriginal
2024-11-19 17:35:02429browse

How do you create XML elements without closing tags in Go?

Creating XML Elements Without Closing Tags

Consider the following nested Go struct:

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"`
}

When initialized and marshaled using encoding/xml, it produces the following output:

<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>

Empty Element Tags vs. Elements with No Content

The distinction between an empty element tag (e.g., ) and an element with no content and an end-tag (e.g., ) is irrelevant from an XML perspective.

Choosing the Tag Form

To control which tag form is used, treat the data as text rather than XML. However, it is generally not necessary to worry about this distinction, as it has no practical implications.

Historical Note

An antiquated recommendation suggests that empty element tags be used solely for elements declared as EMPTY. However, this recommendation is primarily for interoperability with SGML and is not relevant for most modern XML applications.

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