'Select standard transaction mode. This method sets the channel to use
standard transactions. The client must use this method at least once on
a channel before using the Commit or Rollback methods.
:param callable callback: The callback for delivery confirmations'

def tx_select(self, callback=None):

    self._validate_channel_and_callback(callback)
    return self._rpc(spec.Tx.Select(), callback, [spec.Tx.SelectOk])
