change XML output from a WebService ??

[jlrodrigues]

Hello.
I'm not sure if this is the right forum (also posted in XML forum), but my problem is the following:

I have a Webservice e need to access by HTTP POST. I have this method that returns a string and returns always this XML:

<?xml version="1.0" encoding="utf-8"?>
<string xmlns="namespace">string</string>

How can i modify the webservice (or webmethod) to change the output?
For instance, i'd like to output the following:

<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet href="http://localhost/XSLTs/WS1Wm1.xsl" type="text/xsl"?>
<string xmlns="namespace">string</string>

This would save me an entire interface between the WS and my final Http Page.

Really need a help here, i'm a freshman in WebServices, and this is urgent.

(Using VS2003 with C# and .Net 1.1)

Thanks in advance!