invalid tag namespace

[3052]

package main

import (
   "encoding/xml"
   "fmt"
   "github.com/mantyr/xmlutils"
)

const data = `<soap:Envelope
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"></soap:Envelope>`

func main() {
   var envelope struct {
      XMLName xml.Name
      Soap string `xml:"xmlns:soap,attr"`
   }
   xmlutils.Unmarshal([]byte(data), &envelope)
   // {XMLName:{Space:http://schemas.xmlsoap.org/soap/envelope/ Local:Envelope}
   // Soap:http://schemas.xmlsoap.org/soap/envelope/}
   fmt.Printf("%+v\n", envelope)
}

[mantyr]

There's probably something to think about here.
Thanks for your comment.

[3052]

workaround

package xml

import "encoding/xml"

type envelope struct {
   XMLName xml.Name
   Soap soap `xml:"soap,attr"`
}

func (e envelope) MarshalXML(encode *xml.Encoder, _ xml.StartElement) error {
   e.XMLName = xml.Name{Local: "soap:Envelope"}
   type value envelope
   return encode.Encode(value(e))
}

type soap string

func (s soap) MarshalXMLAttr(name xml.Name) (xml.Attr, error) {
   name.Local = "xmlns:soap"
   return xml.Attr{name, string(s)}, nil
}