'Set the query string for this URL.'

@set_changed
def set_querystring(self, qs):

    if isinstance(qs, DataContainer):
        self._querystr = qs
    elif isinstance(qs, basestring):
        self._querystr = parse_qs(qs, ignore_exc=True, encoding=self.encoding)
    else:
        self._querystr = QueryString(qs)
