text: """
  Useful objects based on collections
  """
  
  from __future__ import (absolute_import, print_function)
  
  from astropy.utils.compat.odict import OrderedDict
  
  
  class CaseInsensitiveOrderedDict(OrderedDict):
      """
      docstring for CaseInsensitiveOrderedDict
      """
  
      def __init__(self, *arg, **kwd):
          super(CaseInsensitiveOrderedDict, self).__init__(*arg, **kwd)
  
      def _transform_key(self, key):
          return key.lower()
  
      def __setitem__(self, key, value):
          super(CaseInsensitiveOrderedDict,
                self).__setitem__(self._transform_key(key), value)
  
      def __getitem__(self, key):
          return super(CaseInsensitiveOrderedDict,
                       self).__getitem__(self._transform_key(key))
  
      def __delitem__(self, key):
          return super(CaseInsensitiveOrderedDict,
                       self).__delitem__(self._transform_key(key))
  
      def __contains__(self, key):
          return super(CaseInsensitiveOrderedDict,
                       self).__contains__(self._transform_key(key))
  