Insert the LIGO_LW metadata in the xmltext string into the database.

    @return: message received (may be empty) from LDBD Server as a string

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