'Create a multi-line ASCII string (end of line is "\n") which
represents all datas.
>>> a = RootMetadata()
>>> a.author = "haypo"
>>> a.copyright = unicode("Â© Hachoir", "UTF-8")
>>> print a
Metadata:
- Author: haypo
- Copyright: \xa9 Hachoir
@see __unicode__() and exportPlaintext()'

def __str__(self):

    text = self.exportPlaintext()
    return '\n'.join((makePrintable(line, 'ASCII') for line in text))
