Edit XML before submit

I have a submit button, clicking on it sends XML to an email address.

XML has this :

<OBSERVATION_CODE>

- http://www.xfa.org/schema/xfa-data/1.0/" xfa:dataNode="dataGroup">

<ATWRT>zz</ATWRT>

<ATWTB>By zzzzzz (CAWS/MWSS</ATWTB>

</OBSERVATION_CODE>

I want to remove <OBSERVATION_CODE> and everything belongs to it.

Is there a way to edit xml before submit?