XML unmarshalling in Golang

I want to unmarshall the below xml payload to struct

<linearPackagePublish>
                <linearPackage>
                    <name>ABC</name>
                    <packagedServiceReference>
                        <availabilityWindowEnd>2329-12-31 23:59:59</availabilityWindowEnd>
                        <availabilityWindowStart>2007-11-14 11:40:00</availabilityWindowStart>
                        <packagedServiceId>1111111111</packagedServiceId>
                    </packagedServiceReference>
                    <partnerPackageId>XXXXXXX</partnerPackageId>
                </linearPackage>
                <partnerId>XXXXXX</partnerId>
                <wantLinearPublishResult>true</wantLinearPublishResult>
            </linearPackagePublish>

I want to add transactionId just before <wantLinearPublishResult> tag like this:

<linearPackagePublish>
                <linearPackage>
                    <name>ABC</name>
                    <packagedServiceReference>
                        <availabilityWindowEnd>2329-12-31 23:59:59</availabilityWindowEnd>
                        <availabilityWindowStart>2007-11-14 11:40:00</availabilityWindowStart>
                        <packagedServiceId>1111111111</packagedServiceId>
                    </packagedServiceReference>
                    <partnerPackageId>XXXXXXX</partnerPackageId>
                </linearPackage>
                <partnerId>XXXXXX</partnerId>
		<transactionId>111111111111</transactionId>
                <wantLinearPublishResult>true</wantLinearPublishResult>
            </linearPackagePublish>

For this purpose I was trying to unmarshall the above xml to below struct:

type linearPackagePublish struct {
    LinearPackage           string `xml:"linearPackage"`
    MsoPartnerID            string `xml:"partnerId"`
    TransactionID           string `xml:"transactionId,omitempty"`
    WantLinearPublishResult bool   `xml:"wantLinearPublishResult,omitempty"`
}

But the thing is I don’t want to unmarshall the linearPackage element that is why I put LinearPackage as string in struct

I can also do it via regex but it will be more error prone if something change in the xml.

Is there any way that we can make some nested xml element as a string??

Edited to provide more detail. Including a working demo on Go Playground

Rather than trying to use a string you can define a custom type, with its own marshal and unmarshal functions defined. That way you can have direct control over that element.

You can see the custom datatype holds an array of xml.Tokens. This array is populated during unmarshalling and then written to the encoder during marshalling.

type skipUnmarshal struct {
    data []xml.Token
}

func (s skipUnmarshal) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
    for i := 0; i < len(s.data); i++ {
	    e.EncodeToken(s.data[i])
    }
	return nil
}
func (s *skipUnmarshal) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
	for {
    	t, err := d.Token()
	    if err != nil {
		    break // or alternatively return the error
	    }
	    s.data = append(s.data, t)
    }
    return nil
}