docs: def insert(self,xmltext):
      """
      Insert the LIGO_LW metadata in the xmltext string into the database.
  
      @return: message received (may be empty) from LDBD Server as a string
      """
  
      msg = "INSERT\0" + xmltext + "\0"
      self.sfile.write(msg)
  
      ret, output = self.__response__()
      reply = str(output[0])
  
      if ret:
        msg = "Error executing insert on server %d:%s" % (ret, reply)
        raise LDBDClientException, msg
  
      return reply