具有XML名称空间的属性

Question

The following struct is used to marshall SAML XML elements such as OrganizationName, OrganizationDisplayName & OrganizationURL.

type LocalizedName struct {
    Lang  string `xml:"xml lang,attr"`
    Value string `xml:",chardata"`
}

The Lang attribute is within the xml namespace. The generated XML from the encoding/xml package includes relative namespaces:

<Organization>
  <OrganizationName xmlns:_xml="xml" _xml:lang="en">name</OrganizationName>
  <OrganizationDisplayName xmlns:_xml="xml" _xml:lang="en">name</OrganizationDisplayName>
  <OrganizationURL xmlns:_xml="xml" _xml:lang="en">http://www.example.com/</OrganizationURL>
</Organization>

I was expecting the elements to not use relative namespaces as they seem to be considered to be insecure, although I do not understand why:

<OrganizationName xml:lang="en">name</OrganizationName>

What causes the relative namespaces to be created?

Answer 1

if you want to generate something like this:

<OrganizationName xml:lang="en">name</OrganizationName>

you can use the following:

package main

import (
    "encoding/xml"
    "fmt"
)

//OrganizationName Name
type OrganizationName struct {
    XMLName xml.Name `xml:"OrganizationName"`
    Lang    string   `xml:"http://www.w3.org/XML/1998/namespace lang,attr,omitempty"`
    Value   string   `xml:",chardata"`
}

//Organization Organization Entity
type Organization struct {
    XMLName          xml.Name         `xml:"Organization"`
    OrganizationName OrganizationName `xml:"OrganizationName"`
}

func main() {
    v := Organization{
        OrganizationName: OrganizationName{
            Lang:  "en",
            Value: "Hisham Karam",
        },
    }
    output, err := xml.MarshalIndent(v, "  ", "    ")
    if err != nil {
        fmt.Printf("error: %v
", err)
    }
    fmt.Printf("
%s", string(output))

}

output:

  <Organization>
      <OrganizationName xml:lang="en">Hisham Karam</OrganizationName>
  </Organization>

go version:

go version go1.10.3 darwin/amd64