code: @Path(JaxRxConstants.JAXRXPATH)
      @GET
      public Response getResource(@PathParam(JaxRxConstants.SYSTEM) final String system,
          @Context final UriInfo uri, @Context final HttpHeaders headers) {
          return getResource(system, uri, "", headers);
      }
docs: This method returns a collection of available resources. An available
  resource can be either a particular XML resource or a collection containing
  further XML resources.
  
  @param system
  The associated system with this request.
  @param uri
  The context information due to the requested URI.
  @param headers
  HTTP header attributes.
  @return The available resources resources according to the URL path.