going to fetch a value from xml response when going to parse but i am fail to get value

Question

Below code is the response from the server:

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><SendCardDetailsResponse xmlns="http://tempuri.org/"><SendCardDetailsResult><ROOT xmlns=""><DocumentElement><res-auth><auth-data count='1' ><**attribute name='OTP1'** length='6' type='N' label='OTP' prompt='Please enter OTP as send to your mobile.'/></auth-data></res-auth></DocumentElement></ROOT></SendCardDetailsResult></SendCardDetailsResponse></soap:Body></soap:Envelope>

I have to fetch attribute name which is 'OTP1' how can I get value of attribute name any help will be appreciable