How to replace element value in Soap Body.

[Ramaswamy, Muthu]

Hi All-

I want to replace one of the element value in the SOAP body with a new
value. If I do it through a custom handler what API call should I use. Any
suggestions? Thanks.,

Example:

In-coming Envelope:
==============
<soapenv:Body>
  <ns1:echoMessage xmlns:ns1="testAxis">
   <msgText>Original Message Text</msgText>
  </ns1:echoMessage>
 </soapenv:Body> 

I wish to replace the element value for <msgText> in the Body as follows:
<soapenv:Body>
  <ns1:echoMessage xmlns:ns1="testAxis">
   <msgText>Replaced Message Text</msgText>
  </ns1:echoMessage>
 </soapenv:Body> 

Appreciate your help.,

-Muthu