code: @POST
      @Consumes(APPLICATION_QUERY_XML)
      public Response postQuery(@PathParam(JaxRxConstants.SYSTEM) final String system,
          @PathParam(JaxRxConstants.RESOURCE) final String resource, @Context final HttpHeaders headers,
          final InputStream input) {
          return postQuery(system, input, resource, headers);
      }
docs: This method will be called when a HTTP client sends a POST request to an
  existing resource with 'application/query+xml' as Content-Type.
  
  @param system
  The implementation system.
  @param resource
  The resource name.
  @param input
  The input stream.
  @param headers
  HTTP header attributes.
  @return The {@link Response} which can be empty when no response is
  expected. Otherwise it holds the response XML file.