def is_segment_tokenized(segment):
    """Return True, iff the segment is already tokenized.

    Examples
    --------
    >>> s = ('<segment id="1"><sign pos="ART">Die</sign>'
    ...      '<sign pos="NN">Antwort</sign></segment>')
    >>> is_segment_tokenized(seg)
    True

    >>> seg = etree.fromstring('<segment id="1">Die Antwort</segment>')
    >>> is_segment_tokenized(seg)
    False
    """
    return len(segment) > 0