'Parse a string into a client URN.
Convert case so that all URNs are of the form C.[0-9a-f].
Args:
value: string value to parse'

def ParseFromString(self, value):

    value = value.strip()
    super(ClientURN, self).ParseFromString(value)
    match = self.CLIENT_ID_RE.match(self._string_urn)
    if (not match):
        raise type_info.TypeValueError(('Client    urn    malformed:    %s' % value))
    clientid = match.group('clientid')
    clientid_correctcase = ''.join((clientid[0].upper(), clientid[1:].lower()))
    self._string_urn = self._string_urn.replace(clientid, clientid_correctcase, 1)
