def list_domain_names():
    """
    Lists all search domains owned by an account.
    See also: AWS API Documentation
    
    
    :example: response = client.list_domain_names()
    
    
    :rtype: dict
    :return: {
        'DomainNames': {
            'string': 'string'
        }
    }
    
    
    """
    pass
