@staticmethod
def mention(user):
    """
        Mention a user in a message.  This may trigger a notification for them even if the conversation is muted.

        Args:
            user (SkypeUser): user who is to be mentioned

        Returns:
            str: tag to display the mention
        """
    return '<at id="8:{0}">{1}</at>'.format(user.id, user.name)
