text: """Module for base types and utilities."""
  from __future__ import absolute_import
  
  import warnings
  
  from ._ffi.base import DECORDError  # pylint: disable=unused-import
  from ._ffi.function import _init_internal_api
  
  # A special symbol for selecting all nodes or edges.
  ALL = "__ALL__"
  
  def is_all(arg):
      """Return true if the argument is a special symbol for all nodes or edges."""
      return isinstance(arg, str) and arg == ALL
  
  def decord_warning(msg):
      """Print out warning messages."""
      warnings.warn(msg)
  
  _init_internal_api()
  