def is_lazy_loaded(self, attribute_name):
    """
    Indicates if the specified attribute
    is lazy loaded.

    :type attribute_name: String
    :param attribute_name: The attribute name.
    :rtype: bool
    :return: The lazy loaded flag.
    """

    # sets the lazy loaded flag in case
    # the attribute value is not present
    lazy_loaded = not self.has_value(attribute_name)

    # returns the lazy loaded flag
    return lazy_loaded