how add encoding into xml for export

Hello everybody,

how can I add encode - into xml? :-) i need this - <?xml version="1.0" encoding="UTF-8"?>
from this <?xml version="1.0"?>

Iam using XML DOM Management for creating xml


<?xml version="1.0"?>

-<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/&quot; xmlns:ns1="http://www.teccom-eu.net/wsdl"&gt;
-<o:Security xmlns:o="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd&quot; xmlns:s="http://schemas.xmlsoap.org/soap/envelope/&quot; s:mustUnderstand="1">
-<o:UsernameToken xmlns:u="http://www.teccom-eu.net/wsdl&quot; u:Id="uuid-441ec92f-002a-4c40-adea-a40eb7159b2e">
<o:Username>6790000000930</o:Username>
<o:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">TcCUser_2006!</o:Password&gt;
</o:UsernameToken>
</o:Security>
-<SOAP-ENV:Body>
-<ProcessRequest>
<RequestElement> <FunctionCallRequest xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance&quot;



thx Everyone