First of all, thanks in advance for your help.
I'm trying to connect to a web service, which asks for the xml document to be signed, the connection to the service itself works, but apparently you have to include something like this in the XML text:
<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#" Id="Signature-886be26a-3cce-493d-bae7-2200758a7f62-Signature">XML FIRMADO...</ds:Signature>
It is possible to modify the xml content before it is sent by the SoapHttpClientProtocol class ...
Thanks !!!