xml how to add empty namespace xmlns=""

[ironytr]

i just wanted add empty namespace, used quick fix Xmlns string `xml:"xmlns,attr" but not solving other problems example, int, string types.

tried xml:"* categoryId" turns out -> <categoryId xmlns="*">1001770</categoryId> yet soap api not accepting * character wants <categoryId xmlns="">1001770</categoryId>

type Authentication struct {
    Xmlns string    `xml:"xmlns,attr"  json:"-"`
    AppKey string `xml:"appKey,omitempty" json:"appKey,omitempty"`

    AppSecret string `xml:"appSecret,omitempty" json:"appSecret,omitempty"`
}

type GetSubCategoriesRequest struct {
    XMLName xml.Name `xml:"http://www.n11.com/ws/schemas GetSubCategoriesRequest"`

    Auth *Authentication `xml:"auth,omitempty" json:"auth,omitempty"`

    CategoryId int64 `xml:"* categoryId,omitempty" json:"categoryId,omitempty"` <<<<<<<-------- i need xmlns="" 
}

any help?

Originally posted by @ironytr in https://github.com/golang/go/issues/13400#issuecomment-813019271

[seankhliao]

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