docs: def load_file(self, file_obj, verbose):
          """
          The type of open file objects such as sys.stdout; alias of the built-in file.
          @TODO: when is this used? 
          """
          if verbose: printDebug("----------")
          if verbose: printDebug("Reading: <%s> ...'" % file_obj.name)
  
          if type(file_obj) == file:
              self.rdfgraph = self.rdfgraph + file_obj
              self.sources_valid += [file_obj.NAME]
          else:
              self.loading_failed(self.rdf_format_opts)
              self.sources_invalid += [file_obj.NAME]