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encoding/xml: `,innerxml` makes light of namespaces. #14467

HinataYanagi opened this issue Feb 22, 2016 · 3 comments


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commented Feb 22, 2016

See the example. The result is obviously not what we wish. We have no way we can obtain and recover the context, namely the prefix-namespace correspondence, where the fragment is extracted. I found xml.go naively accumulating input stream in saved while ,innerxml is effective. The best solution is like the below:

buffer := new(bytes.Buffer)
encoder := xml.NewEncoder(buffer)

// ...

for {
  token, err := Token()
  // ...

// ...

saveXMLData = buffer.Bytes()

Namespace-aware ,innerxml is rather expensive, so we may as well have a new flag. Millions of extensible guys are eager for a politic decision.

@HinataYanagi HinataYanagi changed the title encoding/xml: `,innerxml` making light of namespaces encoding/xml: `,innerxml` makes light of namespaces. Feb 22, 2016

@bradfitz bradfitz added this to the Unplanned milestone Apr 10, 2016


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commented Apr 10, 2016

See related bugs: #13400 and #14407


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commented Apr 10, 2016

Namespaces are cumbersome though essential after all. encoding/xml seems to have fundamental defects.


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commented Apr 22, 2018

Reading the namespace of a field can only be done at struct level using the XMLName field. The Unmarshal documentation specifies that

Unmarshal maps an XML element to a struct using the following rules. In the rules, the tag of a field refers to the value associated with the key 'xml' in the struct field's tag (see the example above).`

The storage of the namespace requires the XMLName field in the struct of the XML element. In your example, p is the field tag. So the following structure

/* Space is stored at struct level B and tag field p is read correctly */
	type B struct {
		XMLName xml.Name // To store the name space of the struct
		Content string `xml:"p"` // p tag is the field tag
	type A struct {
		B B `xml:""`  // required to ensure that namespace is stored

reads correctly
<A xmlns:x="urn:"><x:B><p>Go does not spoil its namespace</p></x:B></A>

The absence of the namespace on the B tag means that no default namespace applies to the inner tags
( which looks unwanted in this case. Put it differently, the namespace of a field needs to be at the struct XML tag level to be readable.

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