Hi Mohan
The example you provided does not seem right. Characters like < and > are reserved XML characters and cannot appear unescaped within an XML field, or unless they are wrapped by CData.
If they are considered part of the sourcefieldvalue, then they need to be escaped like < or >. The way they are right now, they are considered child fields/nodes under sourcefieldvalue.
I'd suggest you provide a screenshot of an actual example of the payload. Otherwise if it's just some mock up example as the one you have been providing, it would be hard for anyone here to provide you a suitable solution.
Regards
Eng Swee