In the example below, when the slice of users is marshalled into XML data, the first and last name values are combined into a single fullname tag. This is possible by implementing the MarshalXML function that the package will recognize.
package main
import (
"encoding/xml"
"fmt"
)
type User struct {
FirstName string
LastName string
Age int
}
func (u User) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
start.Name.Local = "user"
if err := e.EncodeToken(start); err != nil {
return err
}
if err := e.EncodeElement(fmt.Sprintf("%s %s", u.FirstName, u.LastName), xml.StartElement{Name: xml.Name{Local: "fullname"}}); err != nil {
return err
}
if err := e.EncodeElement(u.Age, xml.StartElement{Name: xml.Name{Local: "age"}}); err != nil {
return err
}
return e.EncodeToken(start.End())
}
func main() {
users := []User{{FirstName: "Marie", LastName: "Laurent", Age: 49}, {FirstName: "Joao", LastName: "Carvalho", Age: 98}}
data, err := xml.Marshal(users)
if err != nil {
panic(err)
}
fmt.Printf("%s", data)
}Output:
<user><fullname>Marie Laurent</fullname><age>49</age></user><user><fullname>Joao Carvalho</fullname><age>98</age></user>