code: def load_datafile(self, name, search_path=None, **kwargs):
          
          if not search_path:
              search_path = self.define_dir
  
          self.debug_msg('loading datafile %s from %s' % (name, str(search_path)))
          return codec.load_datafile(name, search_path, **kwargs)
docs: find datafile and load them from codec