高分请教：如何才能用socket接收一个XML串，然后作一下处理，再发将这个XML串发出去?

高分求教：如何才能用socket接收一个XML包，然后作一下处理，再发将这个XML包发出去?
如：
一个XML包：
    <?xml version="1.0" encoding="UTF-8" ?> 
 <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:dsmp="http://www.monternet.com/dsmp/schemas/">
 <SOAP-ENV:Header>
  <dsmp:TransactionID xmlns:dsmp="http://www.monternet.com/dsmp/schemas/">700001</dsmp:TransactionID> 
  </SOAP-ENV:Header>
 <SOAP-ENV:Body>
 <UnSubscribeServiceResp xmlns="http://10.1.2.122/misc/dsmp.xsd">
  <Version>1.5.0</Version> 
  <MsgType>UnSubscribeServiceResp</MsgType> 
  <hRet>0</hRet> 
  </UnSubscribeServiceResp>
  </SOAP-ENV:Body>
  </SOAP-ENV:Envelope>----请教!!!!