src/google/appengine/datastore/cloud_datastore_validator.py [691:720]:
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    elif meaning == datastore_pbs.MEANING_PREDEFINED_ENTITY_USER:
      self._validate_predefined_entity_value(value.entity_value, 'user',
                                             _USER_ENTITY_PROPERTY_MAP,
                                             _USER_ENTITY_REQUIRED_PROPERTIES)
    elif meaning == datastore_pbs.MEANING_INDEX_ONLY:
      _assert_condition(constraint.meaning_index_only_allowed,
                        'Value has meaning %d.'
                        % datastore_pbs.MEANING_INDEX_ONLY)

  def _validate_predefined_entity_value(self, entity, entity_name,
                                        allowed_property_map,
                                        required_properties):
    """Validates a predefined entity (e.g. a user or a point).

    Args:
      entity: the predefined entity (an googledatastore.Entity)
      entity_name: the name of the entity (used in error messages)
      allowed_property_map: a dict whose keys are property names allowed in
          the entity and values are the expected types of these properties
      required_properties: a list of required property names

    Returns:
      a dict of googledatastore.Value objects keyed by property name

    Raises:
      ValidationError: if the entity is invalid
    """
    _assert_condition(not entity.HasField('key'),
                      'The %s entity has a key.' % entity_name)
    property_map = {}
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src/google/appengine/datastore/datastore_v4_validator.py [734:763]:
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    elif meaning == datastore_pbs.MEANING_PREDEFINED_ENTITY_USER:
      self._validate_predefined_entity_value(value.entity_value, 'user',
                                             _USER_ENTITY_PROPERTY_MAP,
                                             _USER_ENTITY_REQUIRED_PROPERTIES)
    elif meaning == datastore_pbs.MEANING_INDEX_ONLY:
      _assert_condition(constraint.meaning_index_only_allowed,
                        'Value has meaning %d.'
                        % datastore_pbs.MEANING_INDEX_ONLY)

  def _validate_predefined_entity_value(self, entity, entity_name,
                                        allowed_property_map,
                                        required_properties):
    """Validates a predefined entity (e.g. a user or a point).

    Args:
      entity: the predefined entity (an entity_v4_pb.Entity)
      entity_name: the name of the entity (used in error messages)
      allowed_property_map: a dict whose keys are property names allowed in
          the entity and values are the expected types of these properties
      required_properties: a list of required property names

    Returns:
      a dict of entity_v4_pb2.Value objects keyed by property name

    Raises:
      ValidationError: if the entity is invalid
    """
    _assert_condition(not entity.HasField('key'),
                      'The %s entity has a key.' % entity_name)
    property_map = {}
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