code: def is_manifestation_model(instance, attribute, value):
      
  
      instance_name = instance.__class__.__name__
      is_creation_model(instance, attribute, value)
  
      manifestation_of = value.get('manifestationOfWork')
      if not isinstance(manifestation_of, str):
          err_str = ("'manifestationOfWork' must be given as a string in the "
                     "'{attr}' parameter of a '{cls}'. Given "
                     "'{value}'").format(attr=attribute.name,
                                         cls=instance_name,
                                         value=manifestation_of)
          print(err_str)
docs: Must include a ``manifestationOfWork`` key.