def get_kkf(ekey):
    """
    :param ekey: export key, for instance ('uhs/rlz-1', 'xml')
    :returns: key, kind and fmt from the export key, i.e. 'uhs', 'rlz-1', 'xml'
    """
    key, fmt = ekey
    if '/' in key:
        key, kind = key.split('/', 1)
    else:
        kind = ''
    return key, kind, fmt