Decode it twice like this (try on playground)
package main
import (
"encoding/xml"
"fmt"
)
var data = `<?xml version="1.0"?>
<GetAssignmentResponse>
<Answer><?xml version="1.0" encoding="UTF-8" standalone="no"?>
<QuestionFormAnswers xmlns="http://mechanicalturk.amazonaws.com/AWSMechanicalTurkDataSchemas/2005-10-01/QuestionFormAnswers.xsd">
<Answer>
<QuestionIdentifier>Q1HasEvents</QuestionIdentifier>
<FreeText>no</FreeText>
</Answer>
</QuestionFormAnswers>
</Answer>
</GetAssignmentResponse>`
type Response struct {
XMLName xml.Name `xml:"GetAssignmentResponse"`
Answer string `xml:"Answer"`
}
type Answer struct {
XMLName xml.Name `xml:"QuestionFormAnswers"`
FreeText string `xml:"FreeText"`
}
func main() {
v := Response{}
err := xml.Unmarshal([]byte(data), &v)
if err != nil {
fmt.Printf("error: %v", err)
return
}
fmt.Printf("Answer = %q\n", v.Answer)
a := Answer{}
err = xml.Unmarshal([]byte(v.Answer), &a)
if err != nil {
fmt.Printf("error: %v", err)
return
}
fmt.Printf("Answer = %#v\n", a)
}