docs: def get_pickled_ontology(filename):
  	""" try to retrieve a cached ontology """
  	pickledfile = ONTOSPY_LOCAL_CACHE + "/" + filename + ".pickle"
  	if GLOBAL_DISABLE_CACHE:
  		printDebug("WARNING: DEMO MODE cache has been disabled in __init__.py ==============", "red")
  	if os.path.isfile(pickledfile) and not GLOBAL_DISABLE_CACHE:
  		try:
  			return cPickle.load(open(pickledfile, "rb"))
  		except:
  			print("** WARNING: Cache is out of date ** ...recreating it... ")
  			return None
  	else:
  		return None