How to prase respone returned value using groovy script.

Hi All,

I am new to SoapUI. how to parse the response mesage of Soap.
Sample code to parse this response

<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/">
<S:Body>
<ns2:addResponse xmlns:ns2="http://calculator.me.org/">
<return>88</return>
</ns2:addResponse>
</S:Body>
</S:Envelope>

I want check the return value.

using groovy script or javascript could any guide me.