Unmarshalling escaped XML

In Go, how would I go about decoding this XML response? I've tried building a custom UnMarshal method on my Answer struct, but I'm not having much luck.

<?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>

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)
}

As an alternative, this also works, but it's not as elegant

func (l *AssignmentAnswer) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
    var (
    	content string
    	resp QuestionFormAnswers
    )
    if err := d.DecodeElement(&content, &start); err != nil {
        return err
    }
    c := strings.NewReader(html.UnescapeString(content))

    dec := xml.NewDecoder(c)
    if err := dec.Decode(&resp); err != nil{
    	return err
    }

    *l = AssignmentAnswer{resp}
    return nil
}

type QuestionFormAnswers struct{
	Answers []Answer `xml:"Answer"`
}

type AssignmentAnswer struct{
	QuestionFormAnswers QuestionFormAnswers
}

type Assignment struct{
	AssignmentId     string
	WorkerId         string
	HITId            string
	AssignmentStatus string
	AutoApprovalTime string
	AcceptTime       string
	SubmitTime       string
	ApprovalTime     string
	Answers          AssignmentAnswer `xml:"Answer"`
}