Restful web service not returning XML

I have been trying to get a simple REstful web service working, eventually getting this to talk to a database (via another Java class).

I've started simple, seeing if I can pass in some data and get a response.

The code for the web service is :

package com.mystuff.wstest;

import javax.ws.rs.core.Context;
import javax.ws.rs.core.UriInfo;
import javax.ws.rs.Consumes;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.GET;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;

@Path("/generic")
public class GenericResource
{

   @Context
   private UriInfo context;

   public GenericResource()
   {
   }

   @GET
   @Path("/data")
   @Produces("application/xml")
   public String getXml(@QueryParam("ctype") String cType, @QueryParam("cdata") String cData)
   {
       return ( "<ret><One>" + cType + "</One><Two>" + cData + "</Two></ret>" );
   }

The url to test this is:

 http://localhost:8080/WebSvc1/webresources/generic/data?ctype=a\&cdata=b

But the returned response in the browser does not show as XML, but simply a "ab" - i.e. it's interpreting the XML as HTML tags.

Testing with wget show this:

$ wget -S -q -O - http://localhost:8080/WebSvc1/webresources/generic/data?ctype=a\&cdata=b
  HTTP/1.1 200 OK
  Server: Apache-Coyote/1.1
  Content-Type: application/xml
  Transfer-Encoding: chunked
  Date: Sun, 10 Aug 2014 12:05:37 GMT
<ret><One>a</One><Two>b</Two></ret>

What am I missing?