Finding XML in XML file (node) and change '<' and '>'

Hi,

I created a XML Port which creates teh SOAP envelop and body and exports the Invoice information as needed. The server where i am sending the xml file needs that everithing after in the … node to change

'&'= '&amp', '<'='&lt;'), '>'= '&gt;'))
How do I do that?

Any ideas would help.

Thanks,
S.