docs: def read_yaml(filename, add_constructor=None):
      '''
      Reads YAML files
  
      :param filename:
          The full path to the YAML file
      :param add_constructor:
          A list of yaml constructors (loaders)
      :returns:
          Loaded YAML content as represented data structure
  
      .. seealso::
          :func:`util.structures.yaml_str_join`,
          :func:`util.structures.yaml_loc_join`
      '''
  
      y = read_file(filename)
      if add_constructor:
          if not isinstance(add_constructor, list):
              add_constructor = [add_constructor]
          for a in add_constructor:
              _yaml.add_constructor(*a)
      if y:
          return _yaml.load(y)