code: @POST
      @Consumes({
          MediaType.TEXT_XML, MediaType.APPLICATION_XML
      })
      public Response postResource(@PathParam(JaxRxConstants.SYSTEM) final String system,
          @PathParam(JaxRxConstants.RESOURCE) final String resource, @Context final HttpHeaders headers,
          final InputStream input) {
  
          final JaxRx impl = Systems.getInstance(system);
          final String info = impl.add(input, new ResourcePath(resource, headers));
          return Response.created(null).entity(info).build();
      }
docs: This method will be called when an HTTP client sends a POST request to an
  existing resource to add a resource. Content-Type must be 'text/xml'.
  
  @param system
  The implementation system.
  @param resource
  The resource name.
  @param headers
  HTTP header attributes.
  @param input
  The input stream.
  @return The {@link Response} which can be empty when no response is
  expected. Otherwise it holds the response XML file.