def perform_actions(change_list,comment=nil)
      xml_str = gen_change_xml(change_list,comment)
      @conn.request(@conn.base_url + @host_url+"/rrset","POST",xml_str)
    end
def perform_actions(change_list,comment=nil)
      xml_str = gen_change_xml(change_list,comment)
      @conn.request(@conn.base_url + @host_url+"/rrset","POST",xml_str)
    end
For modifying multiple or single records within a single transaction