解析XML

<?xml version="1.0" encoding="utf-8" ?>
  <string xmlns="http://sureaddress.net/"><?xml version="1.0"?> <AddressResponse xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <ClientNumber>4001386130</ClientNumber> <ReturnCode>100</ReturnCode> <Score>1</Score> <FirmName /> <PrimaryAddressLine>HERNDON STATION SQ# SUITE</PrimaryAddressLine> <City>HERNDON</City> <County>FAIRFAX</County> <State>VA</State> <ZIPCode>20170</ZIPCode> <ZIPPlus4>3757</ZIPPlus4> <Latitude>38.977109</Latitude> <Longitude>-77.385270</Longitude> <TimeZone>-5</TimeZone> <DayLightSaving>true</DayLightSaving> <IsMatchLimitExceed>false</IsMatchLimitExceed> <ResultList /> <GeoCode>US5105936648</GeoCode> <TopMatchUnique>false</TopMatchUnique> </AddressResponse></string>



像这种格式的报文如何解析，去掉"第二个<?xml version="1.0"?>可以很快解析出来，但一加这个就报错，解析不了，麻烦各位帮忙看看，谢谢。。。。